Need chemistry help with a 0.10 M solution of a weak monoprotic acid that has a hydronium-ion concentration

Chemistry
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A 0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 4.2x10–4M. What is the acid-ionization constant, Ka, for this acid?

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Nov 15th, 2015

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-Log 0.1 = 1

4.2x10–4M/1

c. Ka = . 4.2 x 10–4

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Nov 15th, 2015

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