Question

To 10 ml of a 0.1M solution of sodium formate was added 5 ml of 0.05 M hydrochloric
acid solution. Is the resulting solution buffer? Explain your answer with calculation.​

Answer 1

Answer:

Let V mL of 0.10M sodium formate solution should be added to 50ml of 0.05M formic acid to produce a buffer solution of pH 4.0.

pH=pKa+log

[HCOOH]

[HCOONa]

4.0=3.80+log

50×0.05

V×0.10

0.2=log0.04V

0.04V=1.585

V=39.6 mL.

Hence, the correct option is C

Explanation:

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