Q 1221101021.     Calculate The mole ratio of the salt to monobasic acid (`pK_a = 4.699`) in the buffer.
Given: The galvanic cell : `Pt, H_2 (1 `atm)` | ` buffer `|| H^+ (1.0 `M)| `H2 (1` atm `) Pt`, shows e.m.f to be `0.296` V at `25°C`.

A

`5 : 1`

B

`1 : 5`

C

`2 : 1`

D

`1 : 2`

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