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How will you calculate degree of dissociation of weak electrolytes and dissociation constant using Kohlrausch's law? |
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Answer» Solution :(i) The degree of dissociation of weak electrolyte can be calculated from the molar CONDUCTIVITY at a given concetration and the molar conductivity in INFINITE dilution USING the formula `alpha = (Lambda_m)/(Lambda_m^@)` (ii) According to Ostwald.s dilution LAW, `K_a = (alpha^2 C)/(1 - alpha)` Substituting `alpha` value in the above equation `K_a = (Lambda_m^2.C)/(Lambda_m^2 [1 - (Lambda_m)/(Lambda_m^@)]) implies K_a = (Lambda_m^@ C)/(Lambda_m^(@2).((Lambda_m^@ - Lambda_m)/(Lambda_m)) implies k_a = (Lambda_m^2 C)/(Lambda_m^@(Lambda_m^@ - Lambda_m))` . |
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