Calculate the pH of a 0.10 M aqueous solution of the following: a) HCI, b)HOCl (Ka = 4.0 x 10–8) and c)(C2H5)3N (Kb = 5.3 × 10–4)

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Chapter1: Chemical Foundations
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Calculate the pH of a 0.10 M aqueous solution of the following:

a) HCI, b)HOCl (Ka = 4.0 x 10–8) and c)(C2H5)3N (Kb = 5.3 × 10–4)

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for question B, how was 6.3246×10-5 acquired? my calculator gives 2.1x10-4 

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