There are many organic acids and bases in our cells, and their presence modifies the pH...
There are many organic acids and bases in our cells, and their presence modifies the pH of the cell media (cytosol). A solution of equal concentrations of lactic acid and sodium lactate was found to have pH = 3.08.
a) What are the values of pKa and Ka of lactic acid?
b) What would be the pH is the acid had twice the concentration of the salt?
Homework Answers
![pH=pK_a+Log\frac{[A]}{[HA]}](http://img.homeworklib.com/questions/1f459950-575f-11eb-8f5b-538e7d2a8c64.png?x-oss-process=image/resize,w_560)
![a) [HA]=[A]](http://img.homeworklib.com/questions/1fd336c0-575f-11eb-a4bd-a30a7b88852a.png?x-oss-process=image/resize,w_560)
![b)[HA]=2[A]](http://img.homeworklib.com/questions/20c49d70-575f-11eb-8b6d-1f0eb75f1207.png?x-oss-process=image/resize,w_560)
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There are many organic acids and bases in our cells, and their
presence modifies the pH...
What is the pH of a 125mM solution of sodium lactate? Calculate the pH of a...
What is the pH of a 125mM solution of sodium lactate?
Calculate the pH of a 0.579 M aqueous solution of Lactic Acid (pKa = 3.76) Which of the following acids, if in solutions of equal concentration, is the least acidic? a) 0.1M propanoic acid pKa = 4.8 b) 0.1M octanoic acid pKa = 4.89 c) 0.1 M uric acid, pKa = 3.89 d) 0.1 M formic acid pKa = 3.75 e) All of these acids are equally acidic because...
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Determining Ionic StrengthUnlike strong acids and bases that ionize completely in solution, weak acids or bases partially ionize. The tendency to ionize (i.e., the ionic strength) of a weak acid or base can be quantified in several ways includingKa or Kb,pKa or pKb,and percent ionization.Part APyridine is a weak base that is used in the manufacture of pesticides and plastic resins. It is also a component of cigarette smoke. Pyridine ionizes in water as follows:C5H5N+H2O?C5H5NH++OH?The pKb of pyridine is 8.75....
i belive we ade trying to figure out how many mL of each of the solutions...
i belive we ade trying to figure out how many mL of each of
the solutions we need to prepare our buffer
For this experiment you will prepare two different buffers one at pH 4.00 and one at pH 9.00 You will prepare 500 mL of each buffer. Each buffer must have a total conjugate pair concentration of 0.5 M. First, you need to choose your conjugate pair. Below are the salts and acids/bases available and their pka. Conjugate pairs...
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Titration: Acids and Bases 2. How can you determine which acid is diprotic? 3. using the...
Titration: Acids and Bases
2. How can you determine which acid is diprotic?
3. using the answers to questions one and two, which acid is
diprotic?
4. Which base has more hydroxide ions per molecule?
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Determine the pH of the solution (to 2 decimal points) after the addition of 11.7 mL...
Determine the pH of the solution (to 2 decimal points) after the
addition of 11.7 mL of 6.14 M hydrochloric acid (HCl) to 624 mL of
0.735 M phenylamine (aniline)
(C6H5NH2).
Assume that the volumes are additive and that the 5% approximation
is valid.
A table of pKa values can be found here.
Table 10.2: pKa and pKb values at 25 °C for some common weak acids and their conjugate bases Acid name trifluoroacetic acid trichloroacetic acid oxalic acid dichloroacetic...
Acids and Bases 1) Which of the following is a general property of a basic solution?...
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What is the pH of a 125mM solution of sodium lactate?
Calculate the pH of a 0.579 M aqueous solution of Lactic Acid (pKa = 3.76) Which of the following acids, if in solutions of equal concentration, is the least acidic? a) 0.1M propanoic acid pKa = 4.8 b) 0.1M octanoic acid pKa = 4.89 c) 0.1 M uric acid, pKa = 3.89 d) 0.1 M formic acid pKa = 3.75 e) All of these acids are equally acidic because...
i belive we ade trying to figure out how many mL of each of
the solutions we need to prepare our buffer
For this experiment you will prepare two different buffers one at pH 4.00 and one at pH 9.00 You will prepare 500 mL of each buffer. Each buffer must have a total conjugate pair concentration of 0.5 M. First, you need to choose your conjugate pair. Below are the salts and acids/bases available and their pka. Conjugate pairs...
Titration: Acids and Bases
2. How can you determine which acid is diprotic?
3. using the answers to questions one and two, which acid is
diprotic?
4. Which base has more hydroxide ions per molecule?
Acid Volume Base Base Initial Volume (mL) Base Final Volume (mL) Volume of Base Used (mL) Acid: Base Ratio Acid 1 20 mL Base 1 50 mL 34.5 15.5 4:3 Acid 2 20 mL Base 1 Acid 1 20 mL Base 2 Acid 2 20...
Determine the pH of the solution (to 2 decimal points) after the
addition of 11.7 mL of 6.14 M hydrochloric acid (HCl) to 624 mL of
0.735 M phenylamine (aniline)
(C6H5NH2).
Assume that the volumes are additive and that the 5% approximation
is valid.
A table of pKa values can be found here.
Table 10.2: pKa and pKb values at 25 °C for some common weak acids and their conjugate bases Acid name trifluoroacetic acid trichloroacetic acid oxalic acid dichloroacetic...
A buffer solution is able to maintain a constant pH when small amounts of acid or base are added to the buffer. Consider what happens when 1 mL of a 5 M solution is added or 0.005 mol of HCl are added to a 100.0 mL solution acetic acid buffer that contains 0.0100 mol of Acetic acid, HC,H,O,, and 0.0100 mol of sodium acetate, NaC,H,O,. The initial concentration of both the acid and the base are 0.0100 mol/ 0.1000 L...
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