1. Tardigrade
  2. Question
  3. Chemistry
  4. If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water (Δ Tf), when 0.01 mol of sodium sulphate is dissolved in 1 kg of water, is (Kf = 1.86 K kg mol-1)

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Q. If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water $\left(\Delta T_{f}\right)$, when $0.01\, mol$ of sodium sulphate is dissolved in $1\, kg$ of water, is $(K_f = 1.86\, K\, kg\, mol^{-1})$

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Solution:

Vant Hoff’s factor (i) for $Na_2SO_4 = 3$
$\therefore \Delta T_{f} = \left(i\right) k_{f} \,m$
$= 3\times1.80\times \frac{0.01}{1} = 0.0558 \,K$