Heat of Solution

Heat of Solution - Heat of Solution Objective: To determine...

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Heat of Solution Objective : To determine and interpret the heats of solution in water of Lithium Chloride, Potassium Chloride, and Calcium Chloride. Experimental Data : T1 T2 -*C LiCl 23.12 23.24 1.18 KCl 24.49 23.31 2.07 CaCl2 23.25 27.23 3.09 Sample Calculations : LiCl: q surroundings = (m 1 + m 2 ) C soln (T 2 – T 1 ) q surroundings = (1.18 g + 100 g)(4.100 × 10 ^ -3)(23.24 - 23.12) q surroundings = -q salt q salt = 0.0498 ∆H soln = (q salt / m 1 )(molar mass) ∆H soln = (.0.498/1.18)(42.5) ∆H soln = -1.79 ∆H soln = ∆H lattice + ∆H hydration -1.79 = 853 + X X = -854.79 = ∆H hydration Results and Conclusions : Salt ∆Hlattice (KJ/mol) ∆Hsoln (KJ/mol) ∆Hhydration (KJ/mol) Csoln (KJ g-1 deg-1) LiCl 853 -1.79 -854.8 4.100 × 10 ^ -3 NaCl 786 3.9 -782 4.092 × 10 ^ -3 KCl 715 17.5 -697.5 4.038 × 10 ^ -3 CaCl2 2258 -60.7 -2318.7 4.125 × 10 ^ -3 The higher the specific heat capacity, the lower the heat of solution value. The metals, Li, Na, and K, all follow a path in the graph. Also, in the graph the Ca metal does not lie
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This note was uploaded on 03/18/2008 for the course CHEM 1045 taught by Professor Pgamateis during the Spring '08 term at Virginia Tech.

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Heat of Solution - Heat of Solution Objective: To determine...

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