Colligative Properities Date Name Lab Partner Colligative Properties of Solution

Question

Colligative Properities

Date Name Lab Partner Colligative Properties of Solutions: Report Sheet Part A: Freezing point of pure water Solute NaCl CaCl2 2H20 C12H22011 Mass solute molalityTheoretical Theoretical Observed Observed 1.460.50 2 3.701.5033 8.541.4991 “i" factor | F.P. ("C) | “i" factor | F.P. ("C) 1.86-2.32 2.81 928 4.01.07 4.0 4.28 505 3.757 3.99 Show calculations for Fe(NO3) 9H2O here: Fe 56.85 N 3.14-42 0 16.18-288 H 1.01.18-18.18 Total 404.04 g/mol Molality: Theoretical FP: Observed "i" value Discussion: Part B: Freezing point of pure water 0.3°C Freezing point of antifreeze solution 2.6 Trial 1 Trial 2 -2.4 Trial 3 NA Average 25

Explanation / Answer

1. Molarity is defined as moles of solute per litre of solution while molality is defined as moles of solute per Kg of solvent.

2. The properties which depend only on number of moles of solute are called colligative properties.

Eg: relative lowering of vapour pressure, elevation in boiling point, depression in Freezing point, osmotic pressure.

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