Acids and Bases

Question

What is the equilibrium constant, K, for the reaction between HCN (Ka = 6.2 x 10⁻¹⁰) and OH⁻ at 25 °C?

Answer 1

HCN is a weak acid. OH- is a strong base. The reaction is an acid-base neutralization reaction:

HCN + OH- ==> H₂O + CN-

Keq = [CN-] / [HCN][OH-]

Keq is the same as the Ka = 6.2x10^-10