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FR expt 5 heat of solution - Mapa Institute of Technology...

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70L – A31 11 oo.com on, enthalpy, solution calorimeter, salts, endothermic, exothermic Mapúa Institute of Technology School of Chemical Engineering, Chemistry, Biological Engineering and Materials Science Engineering Heat of Solution Austria, Meynard 1 Baniqued, Paul Dominick E. 2 1 Professor, School of Chemical Engineering, Chemistry, Biological Engineering and Materials Science Engineering, Mapua Institute of Technology; 2 Student, CHM170/A31 Physical Chemistry Laboratory 1, Biological Engineering and Chemistry, Mapua Institute of Technology ABSTRACT The heat of solution is a relative measure of the sum of enthalpies involved in the process of dissolution. These enthalpies are involved in the formation and breaking of bonds which may be exothermic or endothermic. The Parr 1455 Solution Calorimeter measures the change in temperature of a certain dissolution process and calculates for the heat of solution given the mass and heat capacity at constant pressure. The samples used were various salts namely: NaCl, NH4Cl and CaCl2. The effect of concentration in the heat of solution was also considered in this experiment by performing the process in different amounts of the salt sample. Based on results, the trend of concentration with the heat of solution is directly proportional favoring the exothermic path. More bonds are broken in a more concentrated solution which explains the increasing exothermic result of the experiment. INTRODUCTION When dissolution happens, processes like breaking and formation of bonds occur. These processes require or release energy in the form of heat. The amount of heat in a solution can be measured by the change in temperature. The heat of solution is a relative measure of the energy or enthalpy of the dissolution process.
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