Stoichiometry Investigation Lab - Jan 28, 2010 Class

LAB:

Stoichiometry Investigation
Testing the Stoichiometric Method

The purpose of this lab is to test if Stoichiometry accurately predicts the mass of the products produced in chemical reactions.

Experimental Design:

2.00g of Strontium nitrate is dissolved in 50mL of water and then reacted with excess Copper (II) sulphate (3.00g). The product is a precipitate( Strontium sulphate and Copper (II) nitrate. After mixing the solutions the precipitate will be separated by filtration, dried and weighed.

Prediction:(What is the theoretical mass of the precipitate?)

1. What is the balanced chemical equation for this reaction?
Sr(NO3)3 + CuSO4 -> SrSO4 + Cu(NO3)2


2. If 2.00g of Strontium nitrate completely reacts, how many grams of Strontium sulphate should be produced?








Procedure:

1. Carefully measure about 3.00g of Copper (II) sulphate.
2. Crush the Copper (II) sulphate into a fine powder using a mortar and pestle
3. Dissolve the Copper (II) sulphate in 50mL of water
4. Carefully measure 2.00g of Strontium nitrate and dissolve it in 50mL of water
5. Slowly pour the two solutions together
6. Stir the mixture to complete the reaction
7. Write your group name on a piece of filter paper
8. Find and record the mass of the filter paper
9. Using a funnel and an Erlenmeyer flask, place the filter paper in the funnel. Slowly pour the mixture into the funnel
10. Pour the filtrate into the waste collection bottle
11. Place the filter paper in the drying oven and record the mass when its dry.