Lab report 7 - Lecture notes 7 PDF

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Lab 7...

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Riley Forbes Lab Partner: Nicholas Grubinger Course: Chemistry Lab 31 Lab Section: L32 TA: Jenna Taft Date: 11/3/16

Experiment #7 Lab Report – Chemical Reactions of Copper: Introduction: The purpose of this lab is to carry out chemical reactions that show the properties of copper and its compounds. This experiment occurs based on the copper cycle as the lab begins with copper as a reactant and through each part of the lab will result in a different product that will ultimately end in copper, as a product. The fact that this experiment begins and ends with copper will allow for students to test the law of conservation of mass and their efficiency by calculating the recovered mass of copper and the percent yield ((actual/theoretical) x100%). Results and Discussion: During our experiment the majority of the lab was spent observing the color changes of each reaction, however three masses were measured including the mass of the stating sample of copper (.0395 g), the mass of the empty evaporating dish (42.8815 g), and the mass of the evaporating dish and recovered copper (42.9110 g). These three masses allowed for the calculation of the recovered mass of copper (.0295 g) and therefore the percent yield (74.68%). The percent yield, which was a little less than threequarters of the mass of the starting copper sample, allowed for the determination of the efficiency of our experiment. One error that could have affected the mass recovered copper and therefore our percent yield was that

when washing the recovered copper some little specks of copper were decanted along with the liquid (particularly during the first rinsing as some stray specks were so small that they floated away with the solution)....