7_Smith_William - William (Jake) Smith CHE 111 016 Fariba...

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William (Jake) Smith CHE 111 016 Fariba Karimi Kasey Rocazella What is Enthalpy? I ntroduction There were various outcome goals for the lab. The first was to learn to find enthalpy and heat of reactions. The second was to learn to find and write net ionic equations. Another goal was to use Hess’s law to find the reaction enthalpy and to learn what a calorimeter is and how to use it. In addition, the goal was to use previous skills to do the experiment. The hypothesis of the lab was: by using a calorimeter the enthalpy change of a reaction can be found accurately. Procedure No changes were made to the procedure. The procedure to lab 7 can found in the lab manual. (Soult, pgs. 79-84) Lab Discussion The experiment contained three chemical reactions. The three chemical reactions are the following: 1. Sodium Hydroxide + Hydrochloric Acid 2. Sodium Hydroxide + Ammonium Chloride 3. Hydrochloric Acid + Ammonia The experiment began with weighing the mass of the Styrofoam cup. 1.7850 grams was the mass of the cup. The mass of the Styrofoam cup including the cold water was 24.9208 g. Using those values, it was found that the mass of the water was 23.1358 g. The next step was to do the calibrations using a 100mL beaker. The measured mass of the beaker was 58.476 g. The mass of the beaker and hot water was found to be 81.1953 g. Using those values, it was found that the mass of the water was 22.7193. The next step was the temperature measurements for the water.
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This note was uploaded on 02/02/2012 for the course CHEMSITRY 105 taught by Professor Soult during the Fall '11 term at Kentucky.

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7_Smith_William - William (Jake) Smith CHE 111 016 Fariba...

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