Chem Exp. Rep. 5

Chem Exp. Rep. 5 - Experiment Report The Thermodynamics of...

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04/06/08 Experiment Report: The Thermodynamics of KNO 3 Dissolving in Water PURPOSE: The purpose of this lab was to measure the solubility of KNO 3 in water at several different temperatures, then using this data to compute the K sp , ∆G, ∆H, and ∆S, for KNO 3 dissolving in water. By simply recording the temperature of the solution when the dissolved ions form a solid, the mass of KNO 3 and the volume of water used to dissociate this salt, we are able to calculate all of the above variables by using Le Chatelier’s principle and a van’t Hoff graph which measures the inverse of the temperature recorded and the natural log of the equilibrium constant (K sp ). By measuring the slope of the van’t Hoff graph, we are able to find the enthalpy of this reaction (∆H), and by measuring the y-intercept of this graph we are able to find the entropy of this reaction (∆S). By using simple substitution we are finally able to find the free
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This lab report was uploaded on 04/08/2008 for the course CHEM 202 taught by Professor Cummings during the Spring '08 term at Nevada.

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Chem Exp. Rep. 5 - Experiment Report The Thermodynamics of...

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