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A 0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 4.6 x 10 -4 M. What is the acid-ionization constant, K,

A 0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 4.6 x 10^-4M. What is the acid-ionization constant, K, for this acid?

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