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Calculating the Ka for monoprotic acid

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A 0.040 M solution of a monoprotic acid is 14 percent ionized. Calculate the ionization constant of the acid.

How do I integrate these two equations to solve this problem?

percent ionizations = ionized acid concentration @ equilibrium/initial concentration of acid

&

Ka= ([H3O+][A-])/[HA]

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The expert calculates the Ka for a monoprotic acid.

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A 0.040 M solution of a monoprotic acid is 14 percent ionized. Calculate the ionization constant of the acid.

How do I integrate these two equations to solve this ...

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