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Chemistry - Lab write up (02-08)

# Chemistry - Lab write up (02-08) - Exp Number One Freezing...

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Exp. Number One Freezing Point Depression 2/06/07 Objectives: The objectives of this experiment were to determine the effects of adding a solute to the freezing point of a solvent, to become familiar with the concept of molality, and to use the relationship between freezing point depression and molality to prepare a solution with a predicted freezing point. Pre-lab Questions: 1. How would you make up a.500 molal solution of sodium chloride in H 2 0, beginning with 50.0g of pure H 2 0? 50gH 2 O x (1 kgH 2 O/1000g H 2 O) = .05g H 2 O .5M= (n NaCl /.05) = .025n NaCl 2. Calculate how many grams of ethylene glycol you would need to add to 100.0g of water to obtain a solution that would freeze at -8ºC. HO-CH 2 -CH 2 -OH (6X1=6 + 2X12=24 + 2X16=36)= 62 C m = (X g /62 g/n) 4.3= (X g/ 62g/n/.1) =26.7g Procedure: The procedure used can found on pages 31-32 of the General Chemistry II Lab manual for the spring semester of 2007. Data: PART A >>> 1) Pure Water in Salt and Ice water Bath Initi al Tem p 30se c 1mi n 1mi n 30se c 2mi n 2mi n 30se c 3 min 3mi n 30se c 4 min 4mi n 30se c 5 min

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