Calorimetry and Thermochemistry Lab Report.pdf - David...

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David Padilla CHEM 121L October 27, 2020 Calorimetry and Thermochemistry Lab Report Calorimetry was used to determine the amount of heat necessary to dehydrate a dehydrated salt by measuring the amount of heat absorbed or produced during two solvation reactions of Magnesium Sulfate heptahydrate and its anhydrous salt. Introduction Calorimetry is the measure of heat flow during different physical and chemical processes. By measuring the change in temperature of the calorimetric substance water which occurs inside a calorimeter as a reaction occurs, then heat flow can be easily calculated by the equation q = sp x m x t where q is heat flow, sp is the specific heat of the substance, m is the mass, and t is the change in temperature which occurs. This lab used a Styrofoam coffee cup as the calorimeter because the coffee cup will not absorb or release significant amounts of heat, skewing the results of the lab. This lab considered two different calorimetric measurements, firstly that of a hot metal so that the metals specific heat may be determined, and then secondly that of multiple chemical reactions, so that Hess’ Law can be applied to determine heat requirements for another reaction for which it is difficult to calculate heat flow. MgSO 4 · 7 H 2 O(s) MgSO 4 (aq) + 7 H 2 O(l) MgSO 4 (s) MgSO 4 (aq) Experimental Data Specific Heat of a Metal - Added 51.122 g of lead to a test tube, put into a beaker and began to heat to 100 o C.

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