6. A 6.881-g sample containing magnesium chloride and sodium chloride was dissolved in sufficient water to give 500 mL of solution. Analysis for the chloride content of a 50.0-mL aliquot resulted in the formation of 0.5923 g of AgCl. The magnesium in a second 50.0-mL aliquot was precipitated as MgNH4PO4; on ignition, 0.1796 g of Mg2P207 was found. Calculate the percentage of MgC12 # 6H2O and of NaCl in the sample.

6. A 6.881-g sample containing magnesium chloride and sodium chloride was dissolved in sufficient water to give 500 mL of solution. Analysis for the chloride content of a 50.0-mL aliquot resulted in the formation of 0.5923 g of AgCl. The magnesium in a second 50.0-mL aliquot was precipitated as MgNH4PO4; on ignition, 0.1796 g of Mg2P207 was found. Calculate the percentage of MgC12 # 6H2O and of NaCl in the sample.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter12: Gravimetric Methods Of Analysis

Section: Chapter Questions

Problem 12.31QAP

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Precipitation Titration

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Question

6. A 6.881-g sample containing magnesium chloride and sodium chloride was dissolved
in sufficient water to give 500 mL of solution. Analysis for the chloride content of a
50.0-mL aliquot resulted in the formation of 0.5923 g of AgCl. The magnesium in a
second 50.0-mL aliquot was precipitated as MgNH4PO4; on ignition, 0.1796 g of
Mg2P207 was found. Calculate the percentage of MgC12 # 6H2O and of NaCl in the
sample.

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