Aqueous solutions of 0.004 M Na2SO4 and 0.01 M Glucose are isotonic. The degree of dissociation of Na2SO4 is
25%
60%
75%
85%
=
i1 C1 RT = i2 C2 RT
i1 × 0.004 = 1 × 0.01
i1 = 2.5
i = 1 + a(n – 1)
2.5 = 1 + a(3 – 1)
1.5 = 2a
a = 0.75
% a = 75
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