0.5 g of the sample containing KHC204.H2C204 and inert impurities is dissolved in water and precipitated with Ca(OH)2 solution. The solution is washed and dried. After igniting, it is weighed as CaO. Calculate the impurity percentage in the sample if 0.224 grams of CaO was formed. KHC2O4 . H2C2O4 = 218.15 g/mol, Ca(OH)2 = 74.0927 g/mol, CaO = 56.07 g/mol

0.5 g of the sample containing KHC204.H2C204 and inert impurities is dissolved in water and precipitated with Ca(OH)2 solution. The solution is washed and dried. After igniting, it is weighed as CaO. Calculate the impurity percentage in the sample if 0.224 grams of CaO was formed. KHC2O4 . H2C2O4 = 218.15 g/mol, Ca(OH)2 = 74.0927 g/mol, CaO = 56.07 g/mol

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

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".

Question

0.5 g of the sample containing
KHC204.H2C204 and inert impurities is
dissolved in water and precipitated with
Ca(OH)2 solution. The solution is washed
and dried. After igniting, it is weighed as
CaO. Calculate the impurity percentage in
the sample if 0.224 grams of CaO was
formed.
KHC204 . H2C204 = 218.15 g/mol,
Ca(OH)2 = 74.0927 g/mol, CaO = 56.07
g/mol
%3D
87.2
25.6
12.8
6.4

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