2) ) A student who wants to make the determination of calcium, and he dissolved impure 0.1453 g CaCO3 solid by pretreatment, then precipitated calcium ions by adding ammonium oxalate. He then titrated the released oxalate ions with the adjusted 0.01923 M KMNO4 solution, spending 15 mL of KMNO4 for titration. In this case, find the mass percentage of calcium in the sample. (Ca: 40 g/mol; CACO3:100 g/mol) 5C,0,2- (aq) + 2MNO4 (aq) + 16H* (aq) → 10CO2 (g) + 2MN2* (aq) + 8H20(aq)

2) ) A student who wants to make the determination of calcium, and he dissolved impure 0.1453 g CaCO3 solid by pretreatment, then precipitated calcium ions by adding ammonium oxalate. He then titrated the released oxalate ions with the adjusted 0.01923 M KMNO4 solution, spending 15 mL of KMNO4 for titration. In this case, find the mass percentage of calcium in the sample. (Ca: 40 g/mol; CACO3:100 g/mol) 5C,0,2- (aq) + 2MNO4 (aq) + 16H* (aq) → 10CO2 (g) + 2MN2* (aq) + 8H20(aq)

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter4: Reactions In Aqueous Solution

Section: Chapter Questions

Problem 71QAP: Calcium in blood or urine can be determined by precipitation as calcium oxalate, CaC2O4. The...

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