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1. 0.4960 g sample of CaCO3 (mw= 100) is dissolved in an acidic solution. The calcium is precipitated as CaC2O4. H20 (mw = 146) and the dry precipitate is found to weigh 0.6186 g. What is the percentage of Cao (mw356) in the sample?

1. 0.4960 g sample of CaCO3 (mw= 100) is dissolved in an acidic solution. The calcium is precipitated as CaC2O4. H20 (mw = 146) and the dry precipitate is found to weigh 0.6186 g. What is the percentage of Cao (mw356) in the sample?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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1. 0.4960 g sample of CaCO3 (mw= 100) is dissolved in an acidic solution. The calcium is precipitated as CaC204. H20 (mw = 146) and the dry precipitate is found to weigh 0.6186 g. What is the percentage of Cao (mw3D56) in the sample? 2. 644 mg of a sample contains Mg (AW = 24) has been dissolved in water. The magnesium content of the sample is precipitated as MgNH4PO4.6H20 and ignited and weighted as Mg,P2O7 (mw= 222). If this weight is 290 mg, calculate the percentage of Mg in the sample?
Transcribed Image Text:1. 0.4960 g sample of CaCO3 (mw= 100) is dissolved in an acidic solution. The calcium is precipitated as CaC204. H20 (mw = 146) and the dry precipitate is found to weigh 0.6186 g. What is the percentage of Cao (mw3D56) in the sample? 2. 644 mg of a sample contains Mg (AW = 24) has been dissolved in water. The magnesium content of the sample is precipitated as MgNH4PO4.6H20 and ignited and weighted as Mg,P2O7 (mw= 222). If this weight is 290 mg, calculate the percentage of Mg in the sample?
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