CBSE Class 12 · 2006 · Delhi Compartment · SolutionsVery Short Answer

Of 0.1 molal solutions of glucose and sodium chloride respectively, which one will have a higher boiling point?

Answer: 0.1 m NaCl — it dissociates into two ions, giving about twice the particles and hence the larger ΔT_b.

Solution

NaCl dissociates into Na

^{+}

and Cl

^{-}

, giving nearly

2 \times 0.1 = 0.2

m particles, while glucose stays molecular at 0.1 m.
The NaCl solution therefore has the larger elevation of boiling point and boils at the higher temperature.

CBSE Class 12 Board · 2006 · Delhi Compartment · Subjective

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