An acidic buffer contains equal concentrations of acid and salt. The dissociation constant of acid is `10^(-5)`. The `P^(H)` of the buffer solution is

Options

A. 5
B. 9
C. 4.49
D. 5.5

Answer

A

Explanation

`P^(H)=P_(ka)+log""([S])/([A])`
If [salt] =[acid]
Then `P^(H)=P^(ka)`
`:.P^(ka)=-log^(ka)=-log10^(-5)=5,`
`:.P^(H)=5`