1.

Which solution has pH equal to 10 ?

Answer»

`10^(-4) M KOH`
`10^(-10) M KOH`
`10^(-10) M HCL`
`10^(-4) M HCl`

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


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