Q.

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 acidHY0.10M . If λX−0≈λY−0, the difference in their  pKa values pKa(HX)−pKa(HY) is (consider  degree of ionization of both acids to be << 1)

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Detailed Solution

For HX and HY, Λα is same. Since λX−°=λY−°∴λC(Hx)λC(iH)=αHXαHY=1/10→H(HX)+H(HY)+=(Cα)HX(Cα)HY=KacHXKacHY
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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 acidHY0.10M . If λX−0≈λY−0, the difference in their  pKa values pKa(HX)−pKa(HY) is (consider  degree of ionization of both acids to be << 1)