Which Expression is Used for Calculating Hydronium Ion Concentration?
A) [H₃O⁺] = K × [HA] / [A⁻]
B) [H₃O⁺] = K × [HA]
C) [H₃O⁺] = (K × [HA]) / [A⁻]
D) [H₃O⁺] = Ka