Chemistry help needed with a 0.10 M solution of a weak monoprotic acid

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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correct answer is d . 1.8 * 10^(-6) 


the calculation is as follows  Ka =  4.2 10^(-4) 4.2 10 ^(-4) / 0.1 = 1.8 * 10^(-6) 

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Nov 15th, 2015

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