SC CHEM 321 - Gravimetric Determination of Calcium (5 pages)

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Gravimetric Determination of Calcium



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Gravimetric Determination of Calcium

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Pages:
5
School:
University Of South Carolina-Columbia
Course:
Chem 321 - Quantitative Analysis

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Experiment 2 Gravimetric Determination of Calcium Chemistry 321L 02M Post Lab By Cameron Kahn 26 February 2014 TA Muditha Dias Kahn 1 P a g e Single Investigator Tasks 10 points each 1 Produce a flow chart depicting your sample handling 2 Tabulate all data Sample A Antacid tablet 1 000mg Mass sample 1 0078 g Mass of Mass of Mass crucibl crucibl product e g e plus g product g Crucible 1 32 44 32 86 0 42 Crucible 2 32 96 33 17 0 21 Crucible 3 24 58 24 70 0 12 Average Molarity of product mol L Mass g of Calcium in 5mL 0 00287 4 0 00143 7 0 00082 1 0 001711 0 115198 1 15198 4 0 05759 0 57599 9 2 0 03291 0 32913 4 8 0 68570 5 0 42225 2 114 3068 Molarity of product mol L Mass g of Calcium in 5mL Weight percent w w of Calcium in sample 0 00084 9 0 00068 4 0 00075 3 0 00076 2 0 034011 0 34011 Standard Deviation Sample B Tums 1 000mg mass sample 1 0055 g Mass of Mass of Mass crucibl crucibl product e g e plus g product g Crucible 1 33 07 33 19 0 124 Crucible 2 32 90 33 00 0 1 Crucible 3 32 49 32 60 0 11 Average Kahn 2 P a g e 0 02742 8 0 03017 1 Mass g of Calcium in 50mL Mass g of Calcium in 50mL 0 27428 2 0 30171 0 30536 7 Weight percent w w of Calcium in sample 57 1534 2 32 6590 9 68 0397 8 33 8249 3 27 2781 7 30 0059 8 30 3696 9 Standard Deviation Class Sample mean sd sd 2 Aantacid weight 68 1 61 3 65 7 21 1 33 5 1 79 55 4 112 4 0 726 2 05 1 8 37 3 10 2 2 34 33 8361 4 34 4916 5 1189 674 0 03306 6 Btums weight 27 3 69 3 37 3 42 2 44 6 2 87 12 17 6 2 34 2 87 20 5 6 22 2 07 22 09 21 0246 2 442 034 8 3 Explain how fundamental measurements show up in this lab and what piece of equipment is calibrated A fundamental measurement is not derived from another measurement In this lab fundamental measurements show up in processes such as measuring mass When measuring the mass of the precipitate we had to use a calibrated balance 4 Solve for the mean and 95 confidence interval for Ca content for your sample Do this for both a and b Do this for both molarity and weight percent The mean



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