Question 12.EP.13: When dissolved in water, HCN is called hydrocyanic acid. Wri...

Chemistry for Engineering Students

When dissolved in water, HCN is called hydrocyanic acid. Write the equilibrium for its reaction in water and identify the conjugate acid–base pairs.

Strategy
Because hydrocyanic acid is behaving as a Brønsted–Lowry acid, it will require some species to accept a proton. Here the proton acceptor is water, as is often the case. This allows us to write the equilibrium for the HCN solution. Once it is written, we identify the conjugate pairs by noting which species differ by only the addition or subtraction of a proton.

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