8 R R Mass of crucible 10.731 Mass of crucible.M.CO, B.114 Mass of crucible .M.CO, Idriedi eist weighing) 13.103 Mass of crucible - MCO, dried (2nd weighing) 3.102 Mass of M.CO 2.371 Mass of filter paper 0.602 Mass of filter paper - Caco, 2./97 Mass of filter paper Caco, c2nd weighing 2.193. Mass of C300, Moles of Coco Molar mass of M.CO Identity of M.CO, Percent error Post-Lab Calculations and Analysis (Sharul work) 1. Calculate the moles of precipitated calcium carbonate. Caco, Enter this value in the Data Table mol mol 2. Calculate the rolar mass of the unknown carbonate Enter this value in the lata Table. 3. From the calculated molar mass, identify the unknown. Calculate the percent error in the molar mass value. Enter both values in the Data Table. 4. Review the procedure and list possible sources of errors that would cause the molar mass of the unknown to be (a) too high or too low. Laboratory Experiments for AP Chemistry 13 Experiment 3 0.598 Pre-Lab Questions (Use a separate sheet of paper to urastever the following questions.) An unknown metal carbonate was analyzed gravimetrically and yielded the following data. Mass of crucible M.CO 12.6278 Mass of crucible 10.655 g Mass of M.CO 1.972 Mass of filter paper Mass of filter paper - Caco, 2.436 Mass of Coco 1.838 Moles of Caco Molar mass of M.CO Identity of M.CO. Percent error 1. From the mass of Caco, calculate the moles of Coco, precipitated. 2. Calculate the molar mass of the unknown. 3. Calculate the molar mass of the following Group 1 metal carbonates a. Laco, 6. Na Co, . co, 4. What is the identity of M_CO, 15. Calculate the percent error in the molar mass determination of M,00, by comparing the experimenty determined molar mass of M.Co, to the known molar mass of the appropriate metal carborate. Materials Chemicals Calcium chloride solution. CaCl, 2.2 M. 125 ml Water distilled or delonized. 200 ml Unknown carbonate sample, M.C0,2 g Equipment Analytical balance, 0.001-2 or 0.0001.& precision Gluss stirring rods, 2 Beakers, 400 ml, 2 Graduated cylinder, 250 ml Bunsen burner Heat-resistant pad Crucible, 15-ml. Ring stand and iron ring Crucible tongs Spatula Drying oven Triangle, clay, pipe stem Filter funnel Wash bottle Filter paper quantitative Watch glass 10 Laboratory Experiments for AP Chemistry