FPDepression_W09

FPDepression_W09 - Chem 125 Dr. Abel Name: Partner(s): Lab...

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Chem 125 Dr. Abel Name: Lab Day and Time: Partner(s): Experiment 3: Colligative Properties of Solutions: Freezing Point Depression Instructions: Each person is to submit an individual report, due at the beginning of lab week 5. You must turn in a typed hard copy of this report. Part 1: Determination of Freezing Point of Pure Water Freezing Point of Pure, Deionized Water: 0.79°C Part 2: Determination of Freezing Points of Known Solutions Name of Solution Investigated: Sodium Nitrate: NaNO 3 Molality of Solution Investigated: 0.099 m In the space below, show how you calculated the molality of the solution you investigated. m=0.00845g/1 g H 2 O (1 mol/85 g) (1000kg/1 g)= 0.0994 m In the table below, record the results of your freezing point measurements for the solution you investigated. Title this table (in the space below) and use units where appropriate. Freezing Point of Sodium Nitrate (NaNO 3 ) Trial No. Freezing Point T f 1 0.58 °C 0.21°C 2 0.57°C 0.22°C 3 0.60°C 0.19°C Average T f 0.207°C In the table below, record the names of the solutions and average T f for the solutions analyzed by your peers. Calculate the molalities and the van’t Hoff factor (both theoretically and experimentally). Title this table (in the space below) and use units where appropriate.
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This note was uploaded on 02/10/2009 for the course CHEM 125 taught by Professor Retsek during the Spring '08 term at Cal Poly.

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FPDepression_W09 - Chem 125 Dr. Abel Name: Partner(s): Lab...

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