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The calcium and magnesium in a urine sample were precipitated as oxalates. A mixed precipitate of CaC2O4 and MgC2O4 resulted and was analyzed by a thermogravimetric procedure. The precipitate mixture was heated to form CaCO3 and MgO. This second mixture weighed 0.0433 g. After ignition to form CaO and MgO, the resulting solid weighed 0.0285 g. What was the mass of Ca in the original sample? 2.42 x 10^-3 g Ca 2.76 x 10^-3 g Ca 6.29 x 10^-3 g Ca 1.57 x 10^-3 g Ca

The calcium and magnesium in a urine sample were precipitated as oxalates. A mixed precipitate of CaC2O4 and MgC2O4 resulted and was analyzed by a thermogravimetric procedure. The precipitate mixture was heated to form CaCO3 and MgO. This second mixture weighed 0.0433 g. After ignition to form CaO and MgO, the resulting solid weighed 0.0285 g. What was the mass of Ca in the original sample? 2.42 x 10^-3 g Ca 2.76 x 10^-3 g Ca 6.29 x 10^-3 g Ca 1.57 x 10^-3 g Ca

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter17: Electrochemistry
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  1. The calcium and magnesium in a urine sample were precipitated as oxalates. A mixed precipitate of CaC2O4 and MgC2O4 resulted and was analyzed by a thermogravimetric procedure. The precipitate mixture was heated to form CaCO3 and MgO. This second mixture weighed 0.0433 g. After ignition to form CaO and MgO, the resulting solid weighed 0.0285 g. What was the mass of Ca in the original sample?
  1. 2.42 x 10^-3 g Ca
  2. 2.76 x 10^-3 g Ca
  3. 6.29 x 10^-3 g Ca
  4. 1.57 x 10^-3 g Ca
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