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Thermodynamic Analysis of Chemical Equilibrium CHEM 1252L-035 December 4, 2017
Abstract: The equilibrium constant of borax dissolution is easily found at any given temperature. Distilled water is added to fill a 250 mL half way and is heated. Then 50 mL of distilled water is added to a clean 100 mL beaker and enough solid borax is added to create an insoluble layer of borax at the bottom. This solution is heated to 65 degrees Celsius while being continuously stirred. Three 250 mL Flasks are obtained. The borax solution is removed from heat and the temperature is allowed to drop to 50 degrees Celsius while being stirred. Once it reached desired temperature, 5.0 mL of the solution is transferred into a 250 mL flask. Then add heated distilled water to flask until it has reached 20 mL. This process is repeated two more times at temperature 30 degrees Celsius and 30 degrees Celsius. The three solutions in the flasks are diluted to 50 Ml each by using room temperature distilled water. Three drops of bromocresol green indicator is added and then the solution is titrated with 0.2 M HCl. Results: 300 305 310 315 320 325 -2 -1.5 -1 -0.5 0 0.5 f(x) = 0.1 x − 33.44 R² = 0.99 lnK vs. Temperature lnK Linear (lnK) Temperature (K) lnK 2

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