If the Ka of a monoprotic weak acid is 3 4 10 6, what is thepH of a 0...

lets mono protic acid HA construct ICE table HA a ....

If the Ka of a monoprotic weak acid is 3.4 Ã— 10-6, what is the pH...

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If the Ka of a monoprotic weak acid is 3.4 Ã— 10-6, what is thepH of a 0.34 M solution of this acid?

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lets mono protic acid = HA

construct ICE table

Â Â Â Â HA (aq) + H2O (l) <----> H3O+ (aq) + A- (aq)

IÂ Â Â Â Â Â 0.34Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0

CÂ Â Â Â -xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +x

E = 0.34-xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +x

Ka = [H3O+] [A-] / [HA]

3.4 x 10^-6 = [x] [x] /[0.34 -x]

x² + x 3.4 * 10^-6 - 1.156 x 10^-6 = 0

solve the quadratic equation

x = 0.001073 M = [H3O+]

pH = -log[H3O+] = -log[0.001073M]

pH = 2.97

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If the Ka of a monoprotic weak acid is 3.4 Ã— 10-6, what is the pH...

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If the Ka of a monoprotic weak acid is 3.4 Ã— 10-6, what is thepH of a 0.34 M solution of this acid?

Answer & Explanation Solved by verified expert

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