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Stoichiometry of a Precipitation Reaction
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Hands-On Labs, Inc.
Version 42-0201-00-02
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
Data Table 1. Stoichiometry Values.
| Initial: CaCl2•2H2O (g) | |
| Initial: CaCl2•2H2O (moles) | |
| Initial: CaCl2 (moles) | |
| Initial: Na2CO3 (moles) | |
| Initial: Na2CO3 (g) | |
| Theoretical: CaCO3 (g) | |
| Mass of Filter paper (g) | |
| Mass of Filter Paper + CaCO3 (g) | |
| Actual: CaCO3 (g) | |
| % Yield: |
Questions
- A perfect percent yield would be 100%. Based on your results, describe your degree of accuracy and suggest possible sources of error.
- What impact would adding twice as much Na2CO3 than required for stoichiometric quantities have on the quantity of product produced?
- Determine the quantity (g) of pure CaCl2 in 7.5 g of CaCl29H2O.
- Determine the quantity (g) of pure MgSO4 in 2.4 g of MgSO47H2O.
- Conservation of mass was discussed in the background. Describe how conservation of mass (actual, not theoretical) could be checked in the experiment performed.
