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Standard XII
Chemistry
Gases in Liquids
From the coll...
Question

From the colligative properties of solution which one is the best method for the determination of mol. wt of proteins & polymers.

A
osmotic pressure
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B
lowering in vapour pressure
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C
lowering in freezing point
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D
elevation in B.Pt
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Solution

The correct option is A osmotic pressure
In chemistry, colligative properties are properties of solutions that depend upon the ratio of the number of solute particles to the number of solvent molecules in a solution, and not on the type of chemical species present. The number ratio can be related to the various units for concentration of solutions. The independence of the nature of solute particles is exact for ideal solutions, and approximate for dilute real solutions.
Osmotic pressure is particularly useful in determination of molar mass of large molecules such as proteins and polymers.
Hence, correct answer is A

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Q. From the colligative properties of solution which one is the best method for the determination of molar mass of proteins and polymers :
Q. The experimental values of colligative properties of many solutes in solution resembles calculated values of colligative properties.
However in some cases, the experimental values of colligative properties differ widely than those obtained by calculations. Such experimental values of colligative properties are known as abnormal values of colligative properties. The causes for abnormal values of colligative properties are:
(i) Dissociation of solute: It increases the colligative properties.
e.g.: Dissociation of KCl, NaCl etc. in H2O.
(ii) Association of solute: It decreases the colligative properties.
e.g.: Dimerisation of acetic acid in benzene.

One mole of I2 (solid. is added in 1M, 1 litre KI solution. Then,
Q. (A) Vapour pressure is a colligative property.
(R) Colligative property depends on the number of solute particles dissolved in the solution.
Q. The experimental values of colligative properties of many solutes in solution resembles calculated values of colligative properties.
However in some cases, the experimental values of colligative properties differ widely than those obtained by calculations. Such experimental values of colligative properties are known as abnormal values of colligative properties. The causes for abnormal values of colligative properties are:
(i) Dissociation of solute: It increases the colligative properties.
e.g.: Dissociation of KCl, NaCl etc. in H2O.
(ii) Association of solute: It decreases the colligative properties.
e.g.: Dimerisation of acetic acid in benzene.

If the degree of dissociation of an electrolyte A2B3 is 25% in a solvent, then:
Q. The best colligative property used for the determination of molecular masses of polymers is:
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