Lab Chem Biol Lab Essay

Stoichiometry of a Precipitation Reaction

Pre Lab Questions: (2Pts.)

1. What are the learning goals of this experiment?
Predict the amount of product produced in a precipitation reaction, accurately measure the reactants and products of the reaction, determine the actual yield vs. theoretical yield, calculate the percent yield.

2. Define the following terms: A. Precipitate:
The creation of a solid in a solution or inside another solid during a chemical reaction.

B. Double displacement reaction:
Chemical reactions in which one component each of both the reacting molecules is exchanged to form the products.

3. What does the stoichiometry of a chemical reaction mean? Why is it important?
Stoichiometry is a section of chemistry that involves using the relationships between reactants or products in a chemical reaction to determine the desired quantitive data.

4. Using the balanced chemical reaction between Sodium carbonate and Calcium Carbonate given in page 92 of your lab manual (first paragraph of procedure), find the mass of Sodium Carbonate (in grams) needed in reaction?
Na2CO3(aq)+CaCl22H20(aq)-CaCO3(s)+2NaCl(aq)+2H2O

Date:_____3/30/2015____________

Name______Chloe Flake______________

1. Title: 1pt
Stoichiometry Of A Precipitation Reaction

2. Procedure: 2pt
(Write the procedure in your own words after you have read the lab manual)

Put on goggles the weigh 1.0 of CaCl*2H2O and put it in 100ml beaker. Add 25 mil of water and stir. I will then use stoichmetry to figure out how much Na2CO3 I will need for a full reaction. I will weigh this and put it in a separate cup. I will now set up a filtration system. I will make sure everything is off the sides and pour the content into the funnel. I will measure out 5ml of water into the cylinder and then pour this in. After this I will pour the liquid in a