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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 concentration and the molar conductivity in infinite dilution USING the formula `alpha = (wedge_(m))/(wedge_(m)^(@))` (ii) According to Ostwald.s dilution law `K_(a) =(alpha^(2)C)/(1-alpha)` Substituting `alpha` value in the above equation `K_(a) = (wedge_(m)^(2).C)/(wedge_(m)^(2).[1-(wedge_(m))/(wedge_(m)^(@))])` `rArr K_(a) =(wedge_(m)^(2)C)/(wedge_(m)^(@).(wedge_(m)^(@)-wedge_(m))` |
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