Question

If a 0.311 M solution of a weak acid is 0.0847% ionized, what is the ionization constant for the acid?

Answer 1

\(HA\rightleftharpoons H^++A^-\); \(K_A=\dfrac{[H^+][A^-]}{[HA]}\)

\([H^+]=[A^-]=0.311*(0.000847)M\)

\([HA]=0.311~M-0.311*(0.000847)M\)

\(K_A=\dfrac{(0.311*(0.000847)M)^2}{(0.311~M-0.311*(0.000847)M)}\)