heat of solution

# heat of solution - Date Performed Date Submitted Instructor...

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Date Performed: 10/29/04 Name:Ronald Lampkins Date Submitted: 12/4/04 Partner: Jenny Charlton Instructor: Mr. Lee Heat of Solution Objective: 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: Solution Mass of Water (g) Mass of solution (g) Initial Temperature ( C) Final Temperature ( C) KCl 100.0 2.09 22.60 21.39 LiCl 100.0 1.18 22.65 24.20 CaCl 100.0 3.12 22.07 25.85 Sample Calculation: q = mass * specific heat * T q = (100 g H 2 O + 2.09 g KCl) * (4.038 x 10-3 kJ g -1 deg -1 ) *(22.6 C– 21.39 C) q = .499 kJ Heat Solution = (q/w 1 ) * molar mass Heat Solution = (.499 kJ / 2.09 g) * (74.6 g/mol KCl) Heat Solution = 17.8 kJ/mol H Hydration = H Lattice - H Solution H Hydration = 715 kJ + 17.8 kJ = 733 kJ Calculations: Salt H Lattice (kJ/mol) H Soln (kJ/mol) H Hydration (kJ/mol) C Soln (kJ g -1 deg -1) KCl 715 17.8 -697 4.038 x10 -3 LiCl 853 -23.1 -876 4.100 x10

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heat of solution - Date Performed Date Submitted Instructor...

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