First slide

Acidic buffer

Question

An acidic buffer contains 0.06 M salt and 0.02 M acid. The dissociation constant of acid is 10^-4. The pH of the buffer solution is

Easy

A

4
B

10
C

4.48
D

9.52

Solution

P^H of an acid buffer solution is given as
P^H = P^K_^a + log $\frac{salt}{acid}$
⇒ P^H = 4 + log $\frac{0.06}{0.02}$
= 4 + 0.4771
= 4.47

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