CHEM 232 Study Guide - Chemical Decomposition, Asteroid Family, Lab Report
9 Nov 2014
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Table 4 chemical equations of the reactions. 4hno3(aq) +cu(s) cu(no3)2(aq) + 2no2 (g) + 2h2o(aq) Cuo(s) + h2so4 (aq) cuso4(aq) + h2o(aq) Percent yield is the weight of copper that was recovered, divided by the total weight of copper wire that was given to us, multiplied by 100%. Percent yield = (0. 1415 g/0. 1432 g) * 100% = 98. 8% Student calamity reported a final yield of 50%. List four things she might have done wrong to account for this yield. This can happened due to following errors during the experiment: some copper might have been stuck on the filter paper, inside walls of flask, on stiring pill; therefore, wasn"t recovered completely, during the manipulations with equpment and products there may have been few spills where certain amount of copper in liquid or solid form was lost, measurment error is possible to due inaccuracy in weight, or titrating solutions. 5: student overachiever reported a final yield of 115%.
