# Solution - Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure

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ConceptColligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure

#### Question

Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K2SO4 in 2 liter of water at 25° C, assuming that it is completely dissociated.

#### Solution

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Determine the osmotic pressure of a solution prepared by dissolving 2.5 × 10−2 g of K2SO4 in 2L of water at 25°C, assuming that it is completely dissociated.

(R = 0.0821 L atm K−1 mol−1, Molar mass of K2SO4 = 174 g mol−1)

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What happens when the external pressure applied becomes more than the osmotic pressure of solution?

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Determine the amount of CaCl2 (= 2.47) dissolved in 2.5 litre of water such that its osmotic pressure is 0.75 atm at 27°C.

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(a) Vapour pressure

(b) Depression in freezing point

(c) Elevation in boiling point

(d) Osmotic pressure

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(i) 1.2% sodium chloride solution?

(ii) 0.4% sodium chloride solution?

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#### Reference Material

Solution for concept: Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure. For the courses 12th CBSE (Arts), 12th CBSE (Commerce), 12th CBSE (Science), PUC Karnataka Science
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