Which solution has pH equal to 10 ?

Options

A. `10^(-4) M KOH`
B. `10^(-10) M KOH`
C. `10^(-10) M HCl`
D. `10^(-4) M HCl`

Answer

A

Explanation

`pOH=- log [OH^(-)]`
`pH+pOH=14`
For `10^(-4)KOH, [OH^(-)]=10^(-4)`
`pOH= - log[OH^(-)]= - log 10^(-4)=4`
pH=14-pOH=10