BIOL240 Lecture Notes - Lecture 18: Sodium Hydroxide, Germain Henri Hess, Hydrochloric Acid
26 Feb 2015
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Document Summary
The foundation of the study of thermochemistry was laid by the chemist germain hess, who investigated heat in chemical reactions during the last century. One statement of the law that bears hess"s name says: The enthalpy change for any reaction depends on the products and reactants and is independent of the pathway or the number of steps between the reactant and product. In this experiment, you will measure and compare the quantity of heat involved in three reactions. These heats of reaction will be measured using a styrofoam calorimeter. Reaction 1: the dissolving of solid sodium hydroxide in water: Reaction 2: the reaction of sodium hydroxide solution with dilute hydrochloric acid solution. Na+(aq) + oh-(aq) + h+(aq) + cl-(aq) -->na+(aq) + cl-(aq) + h2o(l) + heat. Reaction 3: the reaction of solid sodium hydroxide with dilute hydrochloric acid solution: Naoh(s) + h+(aq) + cl-(aq)--> na+(aq) + cl-(aq) + h2o(l) + heat.
