CHM270L expt 5 - , Experiment5 HeatofSolution Section:A31...

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MAPUA INSTITUTE OF TECHNOLOGY School of Chemical Engineering, Chemistry and Biotechnology P h y s i c a l   C h e m i s t r y   L a b o r a t o r y   1 Experiment 5 Heat of Solution Section: A31 Group No.4: Date Performed:  May 22, 2007 Members: Date Submitted:   May 29, 2007 Javier, Sandra        Ko, Denniel Gaviola, Catherine Gososo, Shelamae Olivete, Jasper Ryan Abstract In this experiment, we determine the different heat of solution of sodium  chloride, ammonium chloride and calcium chloride. Using the solution calorimeter,   we determine the heat solution of the said samples. We also determine the heat  solution of the different concentration of each sample. We also verify if the reaction   is endothermic or exothermic. The heat of solution of each samples are -50.311 cal/g, -55.704 cal/g and  -49.034   cal/g   for   sodium   chloride,   ammonium   chloride   and   calcium   chloride,  respectively. 
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I. Introduction The objectives of this experiment are to determine the heat of solution of  common salts namely, sodium chloride, ammonium chloride and calcium chloride  using   the   PARR   1455   Solution   Calorimeter   and   to   determine   the   effect   of  concentration in the heat of solution. We say that enthalpy change of solution (or enthalpy of dissolution) is the  enthalpy change when one mole of a substance is dissolved completely in a large  volume of a solvent at constant pressure. Enthalpy is the stored chemical energy of matter mainly in the virtue of  their bond energies. It is a fact that when a chemical reaction occurs, a change in  energy is also taking place. We hardly determine absolute enthalpy for it is hard to  measure but changes in enthalpy in reactions are easily measured. It is because 
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CHM270L expt 5 - , Experiment5 HeatofSolution Section:A31...

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