Question

Why is elevation in boiling point of water different in the following two solution? (a)0.1MNacl solution (b) 0.1M glucose or sugar solution.

Answer 1

Answer:

The elevation in boiling point depends on the dissociation of particle in solution.

0.1 M NaCl will dissociate into Na+ and Cl-

0.1 M sugar solution will not dissociate.

The number of particle are more in NaCl, the elevation in boiling point is higher.

Answer 2

Answer:

Due to difference in 'i', Vant Hoff factor

Explanation:

Elevation in boiling point = Vant hoff factor × molal boiling point constant × molality

(ΔTb) = (i)(Kb)(m)

and 'i' for NaCl is 2, since it dissociates into 2 ions Na⁺ and Cl⁻, while Sugar or glucose does not dissociate, so 'i' remains 1

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