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Azeotropic Mixtures

10. 1 m aq. s...

Question

10. 1 m aq. solution of a salt shows elevation iin boiling point equal to 3 times of its K Determine() Freezing point of solution(ii) Osmotic pressure at 27 CKwater) 1.86 K kg mole-1

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25^{\circ} C

30

K_{f} (w a t e r) = 1.86 k g m o l^{- 1} K

K_{f} = 1.86

^{- 1}

K_{b} = 0.512

^{- 1}

298 K = 23.756

{100.18}^{\circ} C .

K_{f}

K_{b}

{1.86}^{\circ} C k g m o l^{- 1}

{0.512}^{\circ} C k g m o l^{- 1}

An aqueous solution freezes at -0.2°C. What is the molality of the solution. Determine also the-

(I) elevation in boiling point

(II) Lowering of vapour pressure

Given Kf=1.86°C Kg/mol Kb=0.512°C Kg/mol.

Vapour pressure of water=23.756 mm

25^{o} C

K_{f}

1.86 K m o l^{- 1} k g

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