Solve the following: 1. 0.4960 g sample of CaCO3 (mw= 100) is dissolved in an acidic solution. Thecalcium is precipitated as CaC204. H20 (mw = 146) and the dry precipitate isfound to weigh 0.6186 g. What is the percentage of Cao (mw3D56) in thesample?2. 644 mg of a sample contains Mg (AW = 24) has been dissolved in water. Themagnesium content of the sample is precipitated as MgNH4PO4.6H20 andignited 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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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?

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter12: Gravimetric Methods Of Analysis

Section: Chapter Questions

Problem 12.20QAP

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Question

Solve the following:

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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