What volume of 0.1 M HCOONa solution should be added to 50 ml of 0.05 M formic acid to produce a buffer solution of pH = 4.0, pKa of formic acid = 3.7 ?

# What volume of 0.1 M HCOONa solution should be added to 50 ml of 0.05 M formic acid to produce a buffer solution of pH = 4.0, $p{K}_{a}$ of formic acid = 3.7 ?

1. A

50 ml

2. B

40 ml

3. C

30 ml

4. D

60 ml

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### Solution:

(1)

Let V ml of 0.1 M HCOONa be mixed to 50 ml of 0.05 M HCOOH in mixture

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