Reference no: EM131550221
Stoichiometry of a Precipitation Reaction
Lab Report Assistant
This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment's questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students' writing of lab reports by providing this information in an editable file which can be sent to an instructor.
Exercise 1: Stoichiometry and a Precipitation Reaction
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Initial: CaCl2•2H2O (g)
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1.00
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Initial: CaCl2•2H2O (moles)
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.008
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Initial: CaCl2 (moles)
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.008
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Initial: Na2CO3 (moles)
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.008
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Initial: Na2CO3 (g)
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.85
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Theoretical: CaCO3 (g)
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Mass of Filter paper (g)
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1.02
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Mass of Filter Paper + CaCO3 (g)
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1.70
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Actual: CaCO3 (g)
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.68
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% Yield:
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Questions
A. A perfect percent yield would be 100%. Based on your results, describe your degree of accuracy and suggest possible sources of error.
B. What impact would adding twice as much Na2CO3 than required for stoichiometric quantities have on the quantity of product produced?
C. Determine the quantity (g) of pure CaCl2 in 7.5 g of CaCl2.9H2O.
D. Determine the quantity (g) of pure MgSO4 in 2.4 g of MgSO4.7H2O.
E. Conservation of mass was discussed in the background. Describe how conservation of mass (actual, not theoretical) could be checked in the experiment performed.