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What is the ionization constant of an ac...

What is the ionization constant of an acid if the hydronium ion concentration of a 0.40 M solution is `1.40xx10^(-4)` M?

A

`1.96xx10^(-8)`

B

`1.22xx10^(-9)`

C

`4.90xx10^(-8)`

D

`1.40xx10^(-6)`

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