A perfect percent yield would be 100 based on your results

Question

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

Initial: CaCl2•2H2O (g)	1.00
Initial: CaCl2•2H2O (moles)	.008
Initial: CaCl2 (moles)	.008
Initial: Na2CO3 (moles)	.008
Initial: Na2CO3 (g)	.85
Theoretical: CaCO3 (g)
Mass of Filter paper (g)	1.02
Mass of Filter Paper + CaCO3 (g)	1.70
Actual: CaCO3 (g)	.68
% Yield:

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.