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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
`underset(cong0.25)underset(0.25-x)underset(0.25)(HA)hArrunderset(x)(H^(+))+underset(x)(A^(-))`
`4xx10^(-8)=(x^(2))/(0.25)`
`x^(2)=4xx(25)/(100)xx10^(-8)`
`x=10^(-4)`
`x=[H^(+)]=10^(-4)`
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