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What is the pH in a 0.010 M solution of a moderately weak acid if the Ka = 1.5 × 10^–1 ?

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What is the pH in a 0.010 M solution of a moderately weak acid if the Ka = 1.5 × 10–1 ? 

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In the case of this moderately weak acid we do not have enough difference in the order of magnitude as c/Ka = (0.010/1.5 x 10-1) =0.066 So the following formula should be used:

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