Assignment: EXPERIMENT- Stoichiometry of a Precipitation Reaction

Hands-On Labs, Inc. Version 42-0201-00-02

Review the safety materials and wear goggles when working with chemicals. Read the entire exercise before you begin. Take time to organize the materials you will need and set aside a safe work space in which to complete the exercise.

Experiment Summary:

You will learn about precipitation reactions. You will learn how to use stoichiometry to predict the quantities of reactants necessary to produce the maximum amount of precipitated product. Finally, you will calculate percent yield from a precipitation reaction and determine conservation of mass.

Exercise 1: Stoichiometry and a Precipitation Reaction

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.

Attachment:- Exp-Stoichiometry-of-a-Precipitation-Reaction.pdf