Question

When `2mol` of `HCI` is added to `1L` of an acidic buffer, its `pH` changes from `3.4` to `2.9`. The buffer capacity of the buffer solution is
A. `2`
B. `0`
C. `4`
D. `8`

Answer 1

Correct Answer - C
Buffer capacity
`= ("Number of moles/litre of acid or base added")/("change in pH or pOH")`
`= (2)/(3.4 -2.9) = (2)/(0.5) = 4`