Post-Laboratory Questions (UIse the spaces provided for the answers and additional paper if necessary) 1. A student doing this experiment did not carefully read the Procedure before making up the Cu ion standard solutions. Comment on the effect that each of the following procedural errors had on the estimation of the percent Cu in malachite. Briefly explain. 1) When adding the water to each well, the student held the "H-O" pipet vertically. (2) The student's malachite sample had not completely dissolved when the analysis was done. (3) The student prepared the Cu2+ ion standard solutions but did not have enough time to analyze the malachite solution during the same laboratory period. The standard solutions stood uncovered overnight and were used the following day, when the reaction mixtures were finally prepared. 2. One of the advantages of experiments using microscale methods is that the amount of chemical waste produced is much smaller than the amount generated using experiments with standard methods, thus significantly reducing disposal costs. (1) In a standard-scale determination of percent Cu in malachite, each student used 250 mL of a 0.10NM s solution of Cuso, 5 H,O. Calculate the number of grams of Cu ion that had to be disposed of at the end of the experiment, given a class of 25 students.