heat of solution 2

heat of solution 2 - Date Performed: 2/9/06 Date Submitted:...

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Name: Ronald Lampkins Date Submitted: 2/16/06 Partner: Jason Herrala Instructor: Shengliang Zhao Heat of Solution Objectives: To determine and interpret the heats of solution in water of lithium chloride, potassium chloride, and calcium chloride. To illustrate an application of Hess’ Law. Experimental Data: Salt Mass Used Initial Temperature Final Temperature LiCl 1.18 g 22.47 o C 24.80 o C KCl 2.07 g 24.35 o C 23.46 o C CaCl 3.09 g 24.70 o C 28.46 o C Sample Calculations: g LiCl = (42.39 g/mol LiCl x 1 mol LiCl) / (18.02 g/mol H 2 O x 200 mol H 2 O) x 100 = 1.18 g LiCl q surroundings = (w 1 + w 2 )C soln (T 2 -T 1 ) = (1.18 g LiCl + 100 g H 2 O) 4.1x10 -3 (22.47 o C – 24.80 o C) = 0.967 q salt LiCl= -0.967 kJ H soln LiCl = (q salt / w 1 ) x molar mass = (-0.967 kJ/ 1.18 g) x 42.39 g/mol = -34.74 kJ/mol H hydration LiCl = H soln - H lattice = -34.74 – 853 = -888 kJ/mol Results: Salt H lattice H solution H hydration C solution NaCl +786 kJ/mol +3.9 -782 kJ/mol 4.092 x 10
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This note was uploaded on 03/29/2008 for the course CHEM 1045 taught by Professor Pgamateis during the Fall '08 term at Virginia Tech.

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heat of solution 2 - Date Performed: 2/9/06 Date Submitted:...

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