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A 500.0 mL buffer solution is 0.10 M in benzoic acid and 0.10 M in sodium benzoate. What is the pH of the buffer before and after addition of 200 mL of 0.050 M NaOH?

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13 Dec 2019
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Related questions

Calculate the pH of the following buffer solutions: (anwers given in bold)

1) A solution obtained by adding 30 mL of 0.20 M HOAc to 25 mL of 0.10 M NaOH. R = 4.61

2) A solution that is 0.050 M in formic acid and 0.10 M in sodium form. R = 4.0

3) A buffer solution of acetic acid-sodium acetate of pH 5.00 (initial) whose concentration in NaOAc is 0.100 M, after the addition of 10 mL of 0.1 M NaOH to 100 mL of the buffer. R = 5.12

You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.140 M sodium benzoate. How much of each solution should be mixed to prepare this buffer?

mL benzoic acid?

mL sodium benzoate?

The answer is not 57mL benzoic acid and 43mL sodium benzoate

1. What is the pH of a buffer thatis composed of 100. mL of 0.20 M NH4Cl and 200. mL of 0.10 MNH3?


2. If anacetic acid/sodium acetate buffer solution is prepared from 100.0mL of 0.100 M acetic acid, what volume of 0.100 M sodium acetatemust be added to yield a final pH of 4.00?


3. How manymL of 12.0 M HCl must be added to 500.0 ml of 0.50 M sodium acetateto prepare a buffer of pH 4.75?

4.How many grams of ammonium chloride must bedissolved in 1.00 L of 0.200 M ammonia to make a buffer of pH8.50?


5. Which of the following would be an ideal buffersolution?

0.20 M HCN / 0.10 MKCN 0.20 M HCl / 0.10 M KOH

0.20 M CH3CO2H / 0.10 M HCO2H 0.10 HCl / 0.010 M KCl

Describe how toprepare 500.0 ml of this buffer with maximum bufferingcapacity.

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