SolutionHard

Question

If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water (ᐃTf), when 0.01 mole of sodium sulphate is dissolved in 1 kg of water, is (Kf = 1.86 K kg mol-1)

Options

A.0.0372 K
B.0.0558 K
C.0.0744 K
D.0.0186 K

Solution

Vant Hoff′s factor (i) for Na2SO4 = 3
∴ ᐃTf = (i) kfm
= 3 × 1.80 × = 0.0558 K

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