First slide

Theory of dilute solutions

Question

The elevation in boiling point of 1 molal aqueous solution of urea is X K. The elevation in boing point of 0.2 molal aqueous solution of Aluminium sulphate is (Assuming complete ionization)

Easy

A

3X K
B

5X K
C

2X K
D

X K

Solution

For Urea solution $∆ T_{b} = k_{b} m$ = X
For Al₂(SO₄)₃ solution $∆ T_{b} = i k_{b} m$ i = Vant Hoff Factor
Al₂(SO₄)₃ $⇌$ 2Al⁺³ + $3 {SO}_{4}^{- 2}$
$∆ T_{b} = i k_{b} m$ = 5. k_b $\times$ 0.2

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