Model 1: Boiling and freezing points of selected solutions (1 L total volume) Bo

Question

Model 1: Boiling and freezing points of selected solutions (1 L total volume) Boiling point (C) Freezing polnt (°C) Solution Water 1.0 M Nacl 2.0 M NaCl 1.0 M glucose 1.0 M KBr 1.0 M CaC2 1.0 M Na2S 0.0 100 101 102 100.5 101 101.5 101.5 -3.8 -3.8 -5.7 -5.7 Critical Thinking Questions: 1. Does the boiling point of water increase or decrease with the addition of solute? 2. Does the freezing point of water increase or decrease with the addition of solute? 3. By how much does the boiling point of 1 L of water change with the addition of one mole of Naci? By how much does the boiling point of 1 L of water change with the addition of one mole of glucose? 4. 5. As a team, discuss and predict a reason for the difference between the changes caused by 1.0 M Naci and 1.0 M glucose. (Hint: The formula of glucose is CoH1206. What is the major difference?)

Explanation / Answer

1.

Addition of solute will increase the boiling point of water.

2.

Addition of solute will decrease the freezing point of water.

3.

Boiling point will increase on addition of NaCl in 1 L by 2 0C

4.

Boiling point will increase on addition of Glucose in 1 L by 0.5 0C

5.

Increase in boiling of By addition of NaCl is greater than that of glucose.

This is due to dissociation of NaCl which produce two particle from each NaCl but glucose is non electrolyte which does not undergo dissociation.

NaCl (aq.) -------------> Na+ (aq.) + Cl- (aq.)

C6H12O6 (aq.) -------------> No dissociation

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