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Question

If α is the degree of ionization, C the concentration of a weak electrolyte and Ka the acid ionization constant, then the correct relationship between α, C and Ka is


A

α2 = Ka × C.

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B

α2 = CKa

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C

α = KaC

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D

α = CKa

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Solution

The correct option is C

α = KaC


According to the Ostwald's dilution formula α2 Ka(1 α)C. But for weak

electrolytes α is very small. So that (1 α) can be taken as 1. So that α = KaC.


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