Question: HCN is a monoprotic weak acid with a a value of 4.901010. Calculate the pH of a 6.50106 M solution of this acid taking into

HCN is a monoprotic weak acid with a a value of 4.901010. Calculate the pH of a 6.50106 M solution of this acid taking into account the effects of the autoprotolysis of water. I tried solving it and got a pH of 6.81 which was incorrect.

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