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What is the hydronium ion concentration ...

What is the hydronium ion concentration of a `0.25` M HA solution? `(K_(a)=4xx10^(-8))`

A

`10^(-4)`

B

`10^(-5)`

C

`10^(-7)`

D

`10^(-10)`

Text Solution

Verified by Experts

The correct Answer is:
A
`[H_(3)O^(+)]=sqrt(KaC`
`=sqrt(4xx10^(-8)xx0.25`
`=10^(-4)`
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