1.

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)`

Answer» Correct Answer - 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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