An aqueous solution contains 0.30 M potassium cyanide. One liter of this solution could be converted into a buffer by the addition of:

Question

An aqueous solution contains 0.30 M potassium cyanide. One liter of this solution could be converted into a buffer by the addition of:

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Eirian 1 year 2021-07-31T13:07:53+00:00 1 Answers 23 views 0

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    2021-07-31T13:09:43+00:00

    Answer:

    Hydrocyanic acid, HCN.

    Explanation:

    A buffer is defined as the aqueous mixture of a weak acid and its conjugate base. Or a weak base and its conjugate acid. In the problem, we have a solution of potassium cyanide. The conjugate acid of potassium cyanide is hydrocyanic acid. A weak acid with pKa = 9.89.

    That means, to convert the solution into a buffer we must add:

    Hydrocyanic acid, HCN.

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