First slide

Abnormal Colligative properties ,Vant-Hoff's factor

Question

Colligative properties depend on the number of solute particles present in the solution. Osmotic pressure of 90% ionized 0.1M ${BaCl}_{2}$ solution at $27^{0} c$ is

Moderate

A

5.4 atm
B

4.9 atm
C

6.9 atm
D

7.4 atm

Solution

${BaCl}_{2} ⇌ {Ba}^{+ 2} + 2 {Cl}^{-}; n = 3 i = 1 - α + nα; i = 1 + 2 α; i = 1 + 1.8 = 2.8 (given α = 0.9); π = iCRT; π = 2.8 \times 0.1 \times 0.0821 \times 300 = 6.89 atm$

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