E5 - EXPERIMENT NO. 5 HEATS OF SOLUTION GROUP NO. 2...

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EXPERIMENT NO. 5 HEATS OF SOLUTION GROUP NO. 2 CABUNGCAL, Ma. Andrea Danita E. ChE -2 / 2008140407 Abstract This Final Report discusses about the heat of solution of the different salts we used namely: Sodium Chloride, Ammonium Chloride, and Calcium Chloride. We also determined the heat of solution by studying the effect of changing the concentration of the three salts provided to us by a full, 1/3, and 2/3 sample to be put in the Teflon. This report may also serve as a very reliable data for the heats of solution of the previously mentioned salts since the only experimental procedure we did was the estimation of the concentration of the sample, and the rest of the procedure was done using the PARR 1455 Solution Calorimeter in the Physical Chemistry Laboratory. We had also included our data sheet containing part A and part B of the experiment. Part A confers about the heats of solution of different salts whereas in Part B, the concentrations of these salts were varied. Introduction In this experiment, we should be able to determine the heat of solution of common salts: sodium chloride, ammonium chloride, and calcium chloride using a solution calorimeter. Moreover, we were also expected that by the time we are finished with experiment 5, we would now be able to familiarize ourselves with the functions and use of the PARR 1455 Solution Calorimeter. In addition, we should be able to determine the effect of concentration on the heat of solution of a particular salt. What is meant by “heat of solution”? The heat of solution is the heat that is absorbed when one substance dissolves in another to formation a homogeneous mixture. A homogeneous mixture is one which a
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EXPERIMENT NO. 5 HEATS OF SOLUTION GROUP NO. 2 CABUNGCAL, Ma. Andrea Danita E. ChE -2 / 2008140407 sample of the mixture that contains a substantial number of molecules has the same composition as any other sample: the components of the mixture are distributed uniformly throughout. In common usage, the heat of solution is used in place of the more precise term the enthalpy of solution, which has the symbol ΔHsoln. The enthalpy of solution is the heat of solution for dissolution of one mole of a substance in another substance such that the final solution is one molar and three conditions are fulfilled: (1) the pressure remains constant, (2) the only possible work that occurs is expansion against the atmosphere (so-called PΔV work) and (3) the temperature remains constant during the process. The enthalpy of solution of a substance is only valid for dissolution of the substance in its pure state into another pure substance. Enthalpies of solution for a large number of substances can be measured directly when the resulting solution is liquid, the substance that is dissolved (the solute) is either a solid or liquid and the substance into which the solute is dissolved (the solvent) is liquid. If the solute is dissolved slowly, a very nearly constant temperature can be maintained.
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E5 - EXPERIMENT NO. 5 HEATS OF SOLUTION GROUP NO. 2...

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