The molar conductivity of a solution of a weak acid HX (0.01 M) is 10 times smaller than the molar conductivity of a solution of a weak acid HY (0.10 M). If λ\(^0_{x-}\) ≈ λ\(^0_{y-}\) the difference in their pKa values, pKa (HX) - pKa (HY), is (consider degree of ionization of both acids to be << 1)