Essay About 44.01G And Original Mass Of Cuco3 Present

Use Quantitative Analysis and Chemical Function to Calculate the Mass Percentage of Cuco3 in the Mixture of Cuo and Cuco3
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Chemistry 1A                                                                                                                 Experiment 2 Tittle: quantitative analysis of a mixture (%CuCO3)Propose: Use quantitative analysis and chemical function to calculate the mass percentage of CuCO3 in the mixture of CuO and CuCO3. Introduction: Quantitative analysis is concerned with the determination of the amounts of one particular substance in a mixture. Quantitative analysis is to produce results that are as precise and accurate as possible. The analysis is performed more than once, usually a minimum of three times. The results of all the experimental trials are combined to give one single answer, usually the average value of all the trials. In this experiment, we will identify the percentage of CuCO3 in the mixture of CuO and CuCO3.  Heat the sample to decompose the CuCO3. The loss of mass upon heating will allow you to calculate the amount of CO2 produce, which will allow you to use stoichiometry and calculate the original mass of CuCO3 present. Equipment: Crucible, Bunsen burner, analytical balance, ring stand, clay triangle, wire gauze, clamp, crucible tongs. Procedure: Get the unknown example from teacher, and divide the mixture in three separate samples.Weigh three clean and dry crucibles separately on the analytical balance, and record mass of empty crucible Put 3 mixture samples to three crucibles, and weigh the mass of crucibles and mixture, and record dataMound clay triangle on a ring stand to hold crucibles and heat each of crucibles with a Bunsen burner (top of outer flame) for 5 minutes After heating, put the crucible on the wire gauze to cool down the crucible to room temperature and weigh the crucible, and record data Repeat heating and weighing crucible 3 times, and record weight of crucible after each weighCalculate the percentage mass of CuCO3 of each sample, and get the average value Data & calculation: Unknown number: 572  Chemical equation: copper(II) carbonate + heat → copper(II) oxide + carbon dioxide  Molar mass of CO2: 44.01g/mol  Molar mass of CuCO3: 123.56g/molSample# 123Mass of empty crucible 18.69g                            20.87g                          18.79g                         Mass of crucible + sample before heating 19.60g                          21.69g                                  19.42g                               Mass of crucible + sampleAfter first heating 19.3403g                           21.4517g                               19.2480g                                 Mass of crucible + sampleAfter second heating19.3399g                             1.4513g                               19.2478g                               Mass of crucible + sampleAt constant mass19.3392g                           21.4508g                              9.2472g                         Mass of original sample0.91g0.82g0.63gMass of CO2 produced(mass lost upon heating)0.2608g0.2392g0.1728gMass of CuCO3 in originalsample0.7322g0.6716g0.4851g%CuCO3 in originalsample80.46%81.90%77.00%