Consider equimolar aqueous solutions of a generic weak acid, HA
CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases
Problem
Consider equimolar aqueous solutions of a generic weak acid, HA, and a generic weak base, B, each at an initial concentration of 0.200 M at 25 °C. The acid-dissociation constant for HA is Ka=6.3×10−5, and the base-dissociation constant for B is Kb=1.0×10−6. The ionic product of water at this temperature is Kw=1.0×10−14.
(a) Determine the numerical value of the equilibrium constant, K, for the overall reaction between HA and B in water at 25 °C.
(b) Based on your result in part (a), state whether the reaction mixture will contain a greater concentration of products or reactants at equilibrium, and briefly explain your reasoning without calculating a numerical pH.