Question

What volume
of 0.1 M HCOONa should be added
0.05 M HCOOH
to procluct a buffer of
pH = 4
pka=
3.7​

Answer 1

Answer:

50mL

Explanation:

Given pH = 4

p[H+]=10^-4       Ka=2 x 10^-4

pH = pKa + ㏒[salt]/[acid]

4 = 3.7 + log 0.10xV/v+50/.05/V+50

4 = 3.7 + log V/10

0.3 = log V + 1

1.3 = log V

V/25 = 2

V= 50mL