Find the PKa of a Weak Acid Without PH Meter?

OK - you do not want to use a pH meter, but you have pH papers and pH indicators. So the lack of pH meter is not really a problem. I have read your question carefully. I have to assume that you have the basic laboratory skills to determine pH using pH paper = dip the paper into the acid and compare the colour developed against the standards given with the paper. And also that you are able to carry out an acid/base titration using phenolphthalein indicator. In my answer I am giving you the calculating data. What you are proposing(serial dilutions etc) is totally incorrect. This is in reality a fairly straightfdorward exercise. To calculate the Ka ( and pKA) of the weak acid you need to determine two things: 1) what is the pH of the acid. You do this using the pH paper covering 2-7 range. As above 2) You determine the molarity by titrating against the standard NaOH solution, Because it is a weak acid/ strong base titration you use phenolphthalein indicator. Now you can determine the Ka and pKa. How: ? This is a typical example of how you do the calculation, Let us assume that you have determined that the pH is 4.80 And the molarity of the monoprotic weak acid is 0.185M Assume that the acid is HA, which dissociates: HA H A- You determine the [H] from the equation: [H] = 10^-pH [H] = 10^-4.80 [H] = 1.58*10^-5 Because [H] = [A-], and [HA]>>>>>[H] [H] = [A-] = 1.58*10^-5 [HA] = 0.185 Equation for Ka : Ka = [H] * [A-] / [HA] Ka = [H]/[HA] Ka = ( 1.58*10^-5)/ 0.185 Ka = 2.51*10^-10/0.185 Ka = 1.36*10^-9 That is the answer for Ka value pKa = -log Ka pKa = -log (1.36*10^-9) pKa = 8.87

Find the PKa of a Weak Acid Without PH Meter? 1

1. Help with my 50 meter Butterfly?

Breathe every other stroke, never back to back. ON your dive dolphin kick underwater for several kicks. Same on your turn (assuming this is scm) You can do three kicks, then pull for the event. This is legal and will drop your time. Basically you have 2 positions. Your head and feet do the same thing at the same time. Head and feet are up (1) position, head and feet are down (2nd) position. Start on dryland, forget arms. Just motion. when head and feet are down, you are bent over in nearly a 90 degree bend of the back, legs are straight. In the water this is when hips are up, head and feet are beneath the surface. next change to 2nd position. head and feet are up. STand up, arch back, look at the sky, bend legs so knees are about 45degree angle. practice this. then add arms. when head and feet are down arms are out in front. When head and feet are up, arms are fully extended touching hips. things to work on to improve your time: kicking, dolphin kicking on back and on sides. Laps of it. Squats, lunges (dryland), wallsits arms-if you have access to a vasa trainer, that would be the best, but a rowing machine, rubber tubing (hooked to whatever) stand with arms out in front each hand holding an end of the tubing, and pull straight back passed the hips. A lat machine. FLY drills: single single double (do not breathe on the double) breathe do not breathe breathe 3 dolphin kicks underwater fly underwater recovery

2. Is there meter in this poem?

Meter= Rhythm as given by division into parts of equal duration. As your stanzas are three lines long most are different in meter. Take your first stanza which sound like this- De dum, De dum de dum de dum De dum While your forth stanza sounds- De dum de dum de dum de dum De dum De dum de dum de dum It is good to have a meter as it makes more enjoyable reading to the reader, but sometimes the contents are of more worth. If you try this sounding each stanze like this you will see where changes have to be made.

Find the PKa of a Weak Acid Without PH Meter? 2

3. what is the law for tampering with the power meter in georgia?

It would be considered a theft. Theft of utility. It will be a fully prosecutable offense. If your mom knew it and did nothing, then she is an accomplice. She wo not be able to say, "he did it and I did not know". It's her account, it's her house, she knew the power came back on.

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Knowledge About Analytical Instruments - the Choose and Buy of PH Meter of Analytical Instruments
Knowledge About Analytical Instruments - the Choose and Buy of PH Meter of Analytical Instruments
1. The choose and buy of PH meter of Analytical instrumentsThe instrument is in food, drinking water administrative office in a factory of QS, HACCP certification necessary test equipment. We in the acidity of choose and buy time to consider the following: Pen type pH meter is mainly used to replace the function of the pH paper, has the characteristics of low accuracy, easy to use. Portable pH meter is mainly used in field and field test, to demand higher precision and perfect function. Laboratory pH meter is a kind of desktop precision analysis instruments, require high precision, complete functions, including printing, data processing and so on. Industrial pH meter is used for continuous measurement of industrial process, not only must have the measurement display function, but also has alarm and control functions, as well as installation, cleaning, anti-jamming and so on consideration of the problem. 2. According to the classification accuracy of pH meter instruments: can be divided into class 0.2, 0.1, 0.05, 0.01, the smaller the number, the higher the precision. But the chip development cost is very expensive Pointer pH meter is now rarely used, but the pointer instrument can display the data process of continuous change, so there are used in the titration analysis. 5. See the pH meter to have the supplementary function, for example with the standard RS232 interface, and a heavy is temperature compensation is automatic Or manual, automatic temperature compensation of the PH meter is more convenient than manual temperature compensation of the PH meter, between the price you will understand. Note: the pH meter | acidity meter | acidity meter these three names are the same, just the local or manufacturer is different------2. The classification of the PH meter is introduced of Analytical instrumentsThe classification of the PH meter is introduced: According to the accuracy of measurement Can be divided into class 0.2, 0.1, 0.01 or higher precision. According to the instrument volume Points have pen type (mini), portable, desktop and online continuous on-line monitoring measurement. According to the requirements of use Pen type (mini) and portable PH PH meter is commonly testing personnel to the site inspection. Select PH PH meter accuracy level is decided according to the required precision of user survey, and then according to user's ease of use and choose all kinds of shapes of PH meter. According to the points of portability, divided into: portable pH meter, desktop pH meter and pen pH meter. According to use can be divided into: laboratory pH meter, industrial online pH meter, etc. Divided into economical pH meter according to the advanced level, and intelligent pH meter, precise pH meter or divided into pH meter pointer type, digital display type pH meter. Pen type PH meter, generally made from a single range, narrow measuring range, easy for special equipment. Laboratory PH meter wide measuring range, function, high accuracy of measurement. Industry with the characteristics of the pH meter is to require good stability, reliable operation, has the certain measuring accuracy, strong environment adaptability, strong anti-interference ability, has the analog output, digital communications, upper and lower alarm and control functions, etc.------3. The working principle of dissolved oxygen instrument of Analytical instrumentsFor using activated sludge biological treatment plants, to understand the oxygen content of aeration tank is very important, increase dissolved oxygen in water, can promote the biological activity other than the anaerobic microbes, which can remove volatile substances, and easy to natural oxidation of ions, for sewage purification. The dissolved oxygen using electrochemical measurement in general. The higher the atmospheric pressure, the greater the ability of water dissolved oxygen, their relationship (Henry) by Henry's law and Dalton Dalton's law to determine, Henry's law that the solubility of a gas is directly proportional to the partial pressure. Oxygen measurement sensors by the cathode (commonly used gold and platinum) and with current counter electrode (silver), the current reference electrode (silver), electrode immersed in the electrolyte such as KCl, KOH, sensor diaphragm cover, coated electrode and the electrolyte is separated from measured liquid, only can dissolved gas permeability of coated, so to protect the sensor, can prevent the electrolyte escape, and can prevent the foreign substances of shooting and cause pollution and poison. Silver chloride precipitation on the counter electrode electrochemical equivalent insufficient (electronic), for each oxygen molecules, the cathode released four electronic counter electrode accept electronic, a current: 4 ag 4 cl - 4 agcl 4 e -. The function of the reference electrode is to determine the cathodic potential.------4. The second note of the viscometer of Analytical instrumentsThe viscometer note # 2: In the process of rotor immersed in liquid often with bubbles, in most of the rotor rotation after a period of time will rise disappear, sometimes cannot eliminate bubbles attached to the lower part of the rotor, the existence of the bubble can bring large deviation to measured data, so the leaning slowly into the rotor is an efficient way. Attention should be paid to cleaning method, can use suitable organic solvent soak, don't use metal cutting tools and other hard blow, because the surface of the rotor has serious scratches can cause the deviation of measurement results. Eight, other problems that should pay attention to. 1. Most of the instruments need to adjust the level, after the replacement of the rotor and adjust height of rotor and the level of attention at any time during the process of measuring problem, otherwise it will cause reading deviation and even unable to reading. 2. Some instruments to protect the frame, carefully read the instructions in accordance with the provisions, the installation, otherwise it will cause reading deviation. To sum up, although rotational viscometer of simple structure, easy to use, but if we don't use correctly, an instrument calibration qualified but can't get accurate measurement results, influence the quality of the product.------5. Calorimetric apparatus of Analytical instrumentsAdopt advanced single chip microcomputer system, full automatic operation, manual needed to do is to weigh, reloading and oxygen filling, instrument automatically quantitative water injection, automatic stirring, ignition, output printing results, drainage, etc Calorimetric apparatus of calorimetric system, in addition to water absorbs heat, oxygen bomb, inner barrel, thermometer and agitator is endothermic, and their heat is different, all kinds of factors is more complex, can not rely on simple mathematical calculation, only USES the calorific value of the known benchmark calorimetric system such as benzoic acid to actual calibration temperature rise per 1 to absorb heat, the heat capacity of the calorimeter is calibration. Heat capacity of the calibration is valid for 3 months, but in the following situation occurs, should immediately to calibration: 1, normal use after a significant move of the calorimeter; 2, large oxygen bomb parts replacement calorimeter: such as oxygen bomb cover, link, etc.; 3, the thermometer replacement calorimeter; 4, determination of calorific value, the inner barrel average within the cylinder at the time of actual water temperature and the heat capacity calibration temperature 5 or more; Calorimetric apparatus network advice, if the quantity of heat meter use environment for a long time without a major change, also according to the use of seasonal change every year, divided into spring, summer, autumn and winter, the calibration again.------6. The use of the water quality analyzer matters needing attention of Analytical instrumentsWater quality analyzer in use process should pay attention to the following questions: Its not closed when test is another problem because Karl fischer reagent in the experiment to absorb air moisture, would result in a delay of titration end point. Likewise, use ethyl alcohol reagents, has a similar problem, after take put as far as possible to shorten the time of reaction pool open should be paid attention to. In reaction in the pool, because when the titration reagent to locally, and the electrode is not in one place, so best to fast mixing speed to do not become turbulent, so can the fastest to the end. Titration to fast to try to shorten the test time, and in the end slow strain, which can improve the measurement accuracy. 5, after the completion of the test, be sure to drain system of Karl fischer reagent, then wash clean with methanol, never use water cleaning system, because it is not easy to volatilize, will cause the next test calibration Karl fischer reagent. Manual moisture meter, because must use glass automatic burette metering Karl fischer reagent and methanol solvent, and glass burette itself because of the pressure balance, and must be connected with the outside world. In the air relative humidity is more than 70% of the environment, should try to not arrange moisture test. The titration speed too slow will extend the test process, easy to cause the interference has been slow to reach the end.------7. Sound level meter according to sensitivity classification of Analytical instrumentsAt present, the sound level meter for measuring the noise, the meter response according to the sensitivity can be divided into four kinds: Header time constant is 1000 ms, - and used to measure the steady state noise measured value as valid. Fast gear close to the human ear response to sound. Whose hands rise time of 35 ms, used to measure the duration of the long pulse noise, such as punch, according to the hammer, the measured value for maximum RMS. The maximum value. Within the domestic type ND2 precision sound level meter installed a frequency doubling process filter pages, easy to carry to the scene and the spectrum analysis. Sound level meter in use can be divided into two categories: one kind is used to measure the steady state noise, are used to measure not steady state noise and impulse noise. Noise dosimeter is also a kind of integral type sound level meter, mainly used to measure the amount of noise exposure. Pulse sound level meter is used to measure impulse noise, the sound level meter conforms to the human ear to sound pulse response and the median time to response to sound pulse to the human ear. Now it is not only used in acoustics and electroacoustics measurement, and has been extensively used in the design of machine manufacturing, construction, transportation, environmental protection, health and defence engineering and other fields, become almost all departments must possess acoustic measuring instrument.------8. The typical structure of the ion chromatograph of Analytical instrumentsIon chromatograph of typical structure: Ion chromatograph of typical structure by infusion pump, injector valve, chromatographic column, column, detector and a data processing system. Infusion pump Both the movement of the piston rod has a time lag, just compensation mobile phase output pulse, so the velocity is quite smooth. The injection valve Amount of sampling methods is six valve sample, the method of incoming sample amount is variable scope is big, high pressure resistance, and easy to automate. The chromatographic column Ion chromatograph column packing is a hotspot of research on ion chromatograph, is the main driving force in the development of ion chromatograph, developing very quickly. Ion switch sensor is divided into two categories, namely, electrochemical detector and optical switch sensor, dc ampere, pulse electrochemical detector including conductance, amp and integral amp, etc., and optical detector including ultraviolet, or see the light and fluorescence detector. The conductance detector is the most important detectors, ion chromatography is a brief introduction is as follows. Flow conductance detector is by ion chromatography phase conduction as the basis of quantitative changes. Through to the movement of current measurement can know the concentration of the ions in the solution. And if a high electrical conductivity of the mobile phase, and the electrical conductivity of the sample is low, then the conductance detector wouldn't be effective to detect the samples of the concentration of the ions. As a result, people in the chromatographic column plus a inhibition between column and a conductivity detector, it can change the flow and the electrical conductivity of the sample, so that the sample ion sensitive detection.
2021 09 15
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The PH Meter Was Not Properly Calibrated?
The PH Meter Was Not Properly Calibrated?
Not properly calibrating the pH meter wo not affect the precision, but it will affect the accuracy. "Accuracy" is how close to the "right answer" you are. "Precision" deals with the reproducibility of the measurements and is related to the number of significant digits to which we make a measurement.1. Whatever happened to the laser glucose meter or something like that?So far, ALL of the non-invasive glucose monitor have proven to be less than accurate. There is no getting around it -- the mots accurate way to test blood sugar is to take a drop of blood! And frequency and accuracy of the blood sugar reading is critical to your continued good health. You need to know EXACTLY (at least, within about 10 points) of what your blood sugar is. The only way to do that is by taking a sample of blood.2. what dpi i will use for 1 meter print?You need to check with your printer for the recommended resolution and file format. Most likely they will want 300 DPI and .TIF format. But, they may prefer CMYK (if you are doing offset printing) or JPEG depending on their process3. What's the best brand of glazed porcelain floor tiles that looks like natural stone?wet underfloor heating is cheaper that those exspensive electric underfloor mats. 15mm plastic underfloor pipe cost around 1 per meter, the manafold can be made with plumbing fittings (no need to buy a exspensive ready made manofold), as long as you have pleanty of floor insulation and can lay the pipes into the floor screed, the cost of materials is small. electric underfloor tile heating systems, only take the chill from the tiles, they are normilly used with centrol heating radators for the realy cold weather. I would not recomend electric underfloor heating as the sole heating source unless your going to use plenty of floor insulation and have a draft free house4. 1600 meter times for a freshman?5:03 is a good freshman time. The sub 5 mile is just around the corner for you. My best when I was a freshman was 4:56. I was a 3200 runner as freshman. ran a 10:05 for that then. A guy that is a freshman on my track team now ran a 4:21 mile as a freshman which is about a 4:19 1600, but he is probably one of the most talented runners i have ever met.5. How to install a new electric meter box?If you are talking about the box that holds the meter you should call a pro because you are dealing with un fused electric that you can not shut off it WILL kill you!6. iPod touch battery meter inaccurate?Try letting it drain completely, then doing a full charge. That works for me7. What is the meter in the top right of Dauntless for?That's the Danger meter. It will slowly increase while fighting a behemoth and while downed, and can be decreased by making a behemoth flee the area or reviving downed allies. If the meter reaches 100% players can not be revived anymore, and the behemoth hits much harder8. How long does a Glucose Meter last?I've researched this for the same reasons your concerned about it and the best information I've discovered is that glucose meters tend to lose some of there efficiency or accuracy somewhere between one and two years. What I do is to use two different meters, one as a primary and one as a backup you wo not need the backup meter as long as your primary meter is giving results approx. where you think they should be, the results should be within 10-15% of each other. As to where to prick yourself you should be using different fingers on every test and use the sides of your fingers rather than the center where there may be more calloused.9. How much Should a Diode Read on a Multi Meter?With regard to readings obtained when testing diodes/rectifiers using the Diode Test Range of a multi-meter, it should be noted that semi-conductor devices are considered to be non-linear in terms of resistance. The same diode measured on different instruments is likely to give differing results since the reading will depend to some extent, on the level of test current output by the multi-meter. The reading obtained will be the forward voltage drop in mV and will vary by type of device and ambient temperature, as other contributors have indicated. In the vast majority of circuits, the difference in reading between a forward and reverse biased 'healthy' diode is generally so great as to enable GO/NOGO checks to be carried out with the device in-circuit, but unpowered of course!The base-emitter and base-collector junctions of bipolar transistors may be similarly GO/NOGO checked
2021 09 15
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Which Digital Autorefractometer Company Doing OBM?
Which Digital Autorefractometer Company Doing OBM?
In this competitive industry, MeCan is one of the reliable Digital Autorefractometer producers in China. From raw materials selection to a completed product, a trusted provider should always focus on the perfect and exact operation during each step, making sure high-quality products are provided to clients. The company upholds the tenet that a professional service team is also a very important part of the business. It can guarantee a thoughtful service.By keeping track with the market development, we are occupied in manufacturing and trading a wide array of Digital Autorefractometer. Digital Autorefractometer designed by Guangzhou MeCan Medical Limited is more aesthetically appealing than other usual Digital Autorefractometer. Guangzhou MeCan Medical Limited has established a complete set of product development, production control, logistics distribution and after-sales service system.From the initial order to the delivery and pick-up, we ensure you always receive prompt attention and expert advice. Ask!· Related Questions:1. What are SMEs for Digital Autorefractometer?Small and medium enterprises play an important role in producing high-quality products and creating continuous cash flow to society. MeCan is one of the leading small and medium enterprises having a base in China. After years of development, we have accumulated experience in applicable techniques and personnel allocation. We grow up as a mature SME by keeping absorbing advantages and disadvantages from other enterprises. To maintain our advantages in the industry, we have tried our best to improve the quality of Digital Autorefractometer and productivity, and we believe that a more prosperous future will be achieved. ——————— 2. What companies are producing Digital Autorefractometer?Many firms are involved in the production of Digital Autorefractometer. MeCan is just one of these. After years of evolution, we're now able of substantial quantity production. Advanced technology and reliable raw materials are employed. An entire service system has been constructed to strongly support the sales. ——————— 3. Which Digital Autorefractometer company doing OEM?As Digital Autorefractometer is demanding quickly, the needs of customers also vary. Thus, more and more producers start to focus on developing their OEM service. MeCan is one of them. A manufacturer that can do OEM service is capable of manufacturing based on the drawings or sketches provided by the seller. The company has been providing expert OEM service for clients since its establishment. Because of its highly innovative technology and experienced staff, the final product is widely recognized by clients. ——————— 4. Any brands for high end Digital Autorefractometer?MeCan might be the most sought-after partner to help produce high end Digital Autorefractometer and deliver high-quality services in China. With strict attention to detail from design through to production, we offer a product line that is high-quality and reliable, and has a high cost-performance ratio. Here the emphasis is also placed on developing new products to meet the changing trends of the modern market. Over the past years, MeCan has won a reputation for quality, innovation, leadership, operations, and customer service, plus a good partner to work with.
2021 06 16
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