11.Calculate the mass of ascorbic acid (Vitamin C, C6H8O6) to be dissolved in 75 g of acetic acid to lower its melting point by 1.5 0C. Kf= 3.9 k kg mol–1.
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12.Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL at 370C.
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Short Answer Type
13.Suppose a solid solution is formed between two substances, one whose particles are very large and the other whose particles are very small. What kind of solid solution is this likely to be?
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14.Amongst the following compunds identify which are insoluble, partially soluble and highly soluble in water? (i) phenol (ii) toluene (iii) formic acid (iv) ethylene glycol (v) chloroform, (vi) pentanol.
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15.Two liquids A and B boils at 1450C and 1900C respectively. Which of them has a higher vapour pressure at 800C ?
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16.Define ‘mole fraction’ of a substance in a solution.
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17.What is expected value of Van’t Hoff factor for K3 [Fe(CN)6] in dilute solution?
18.State the formula relating pressure of a gas with its mole fraction in a liquid solution in contact with it.
solution:
The most commonly used form of Henry’s law states that “the partial pressure of the gas in vapour phase (p) is proportional to the mole fraction of the gas (x) in the solution”
Pgas = Mole fraction gas of gas x KH, where KH is Henry law constant ⇒ p = KH.x where ‘x’ is mole fraction.
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19.What would be the value of Van’t Hoff factor for a dilute solution of K2SO4 in water?
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20.In the determination of molar mass of A+B– using a colligative property, what may be the value of Van’t Hoff factor if the solute is 50% dissociated?
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