Pure water freezes at 0 oC and boils at 100 oC at standard conditions. Calcium chloride was added to pure water. What do you expect about its freezing point and boiling point?
Correct answer: D. Freezing point decreases and boiling point increases
- A. No change in its freezing point and boiling point
- B. Freezing point increases and boiling point decreases.
- C. Freezing point increases and boiling point increases
- D. Freezing point decreases and boiling point increases
Explanation
The presence of impurities in a substance lowers the melting point but increases the boiling point of the substance.
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About Colligative Properties
Colligative properties depend on the number of dissolved particles rather than their chemical identity. The topic covers relative lowering of vapour pressure, elevation of boiling point, depression of freezing point and osmotic pressure, including electrolyte dissociation, the van’t Hoff factor and molar-mass calculations.
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