Exp. 13 - Heat of Solution

Exp. 13 - Heat of Solution - Date Performed Heat of...

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Date Performed: 2/10/2011 Heat of Solution Objectives: The main objective of this experiment was to determine and interpret the heats of solution in water of lithium chloride, potassium chloride, and calcium chloride. Also, another objective was to illustrate an application of Hess’ Law. Experimental Data: Salt Mass of empty container (grams) Mass of container + salt (grams) Temperature of H 2 O, T 1 ( o C) Temperature of H 2 O , T 2 ( o C) Lithium Chloride (LiCl) 33.75 g 34.93 g 21.40 o C 23.60 o C Potassium Chloride (KCl) 33.75 g 35.82 g 21.55 o C 20.25 o C Calcium Chloride (CaCl 2 ) 33.75 g 36.84 g 20.95 o C 24.01 o C Sample Calculations: Mass of salt = mass of container with the salt – mass of the container = 34.93g – 33.75g = 1.18 g of LiCl q surroundings = mass x specific heat capacity x T = (m Δ 1 + m 2 )C soln (T 2 – T 1 ) + C cal (T 2 – T 1 ) = (100g + 1.18g)(4.1x10 -3 )(23.60 – 21.40) + 0 (23.60 – 21.40) = .912 KJ q salt = q salt = - q surroundings = .912 KJ = -.912 KJ Δ H soln = (q salt / m 1 ) x molar mass = (-.912 KJ/1.18g) x 42.39 g/mol = -32.76 KJ/mol
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Δ H hydration = Δ H soln = Δ H lattice + Δ H hydration = -32.76 KJ/mol = 853 KJ/mol + Δ H hydration Δ H hydration = -885.76 KJ/mol Results and Conclusions Salt Mass (grams) Δ H lattice (KJ/Mol) Δ H soln (KJ/Mol) Δ H hydration (KJ/Mol) Lithium Chloride (LiCl) 1.18 g +853 KJ/mol -32.76 KJ/mol -885.76 KJ/mol Sodium Chloride (NaCl) 1.62 g +786 KJ/mol +3.9 KJ/mol -782 KJ/mol Potassium Chloride (KCl)
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Exp. 13 - Heat of Solution - Date Performed Heat of...

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