Gce Model Questions Vol1 2025 Chemistry Question 6

Practice essay / theory question 6 from the 2025 Gce Model Questions Vol1 Chemistry examination. This question covers Colligative properties, Freezing point depression, Boiling point elevation, Vapour pressure lowering .

Gce Model Questions Vol1 2025 Chemistry Essay / Theory
Topics: Colligative properties Freezing point depression Boiling point elevation Vapour pressure lowering
Question 6 GCE_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • essay

A 2.00 g sample of a non‑volatile solute is dissolved in 100.0 g of water. The freezing point of the resulting solution is observed to be –0.52 °C.

Question Parts

( a )
Calculate the molar mass of the solute using the freezing point depression data. (K_f for water = 1.86 °C·kg·mol⁻¹.)
( b )
The solution is then heated and the temperature at which its vapour pressure reaches 100 kPa is recorded as 78.0 °C. Given that the normal boiling point of pure water is 100 °C at 101.3 kPa, explain qualitatively how the presence of the solute affects the boiling point and vapour pressure.
( c )
Sketch a qualitative heating curve for the solution, indicating the positions of the freezing point, boiling point, and any phase changes. Comment on how the curve differs from that of pure water.

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About This Question

This is Gce Model Questions Vol1 2025 Chemistry Question 6. It is one of the essay questions from the 2025 Gce Model Questions Vol1 Chemistry examination.

The question covers Colligative properties, Freezing point depression, Boiling point elevation, Vapour pressure lowering .

View More Gce Model Questions Vol1 2025 Chemistry Questions More Gce Model Questions Vol1 Practice Questions Back to Questions

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