1. Limiting Reagent

2. To make a cheese sandwich, you need 3 slices of cheese and 2 slices of bread. If you have 30 slices of bread and 30 slices of cheese, how many cheese sandwiches can you make?

3. When two substances react in a chemical reaction, there is generally a limiting factor or what we call in chemistry, a limiting reactant/reagent.

4. What is my limiting reagent/reactant in this situation?

5. The limiting reactant is the factor that is consumed entirely and it
limits how far the reaction can proceed, or how much product can be made.

6. Don’t forget!!! the amount of product produced in a chemical reaction is dependant on the “limiting” reactant/reagent.
The reactant that is not entirely consumed is called the “excess” reactant/ reagent.

7. Which reactants are in excess in this situation?

8. Example #1: What mass of silver sulfide is produced from a mixture of 2.0 grams of silver and 2.0 grams of octatomic sulfur, S8?
Write a balanced equation

9. Using both amounts given to you, find the moles of silver sulfide each of these amounts of reactants could produce:
a) b)

10. Once 9.26 x 10-3 moles of silver sulfide is produced, there is no more Ag to react with the sulfur; therefore Ag is the limiting reactant and sulfur is in excess.
Now we can answer the initial question by using this number of moles of Ag2S and converting it to grams of Ag2S:

11. Example #2: What is the maximum amount of ammonia that can be produced from grams of nitrogen and 500. grams of hydrogen?
Balanced Equation: a) b)

12. Limiting Reactant Lab Purpose:
To retrieve pure copper from a copper chloride compound.
Safety:
Put on your goggles!!!!!! Follow all safety precautions!

13. TAKE A PICTURE OF YOUR LAB STATION BEFORE YOU START.
Materials:
Crystalline copper chloride.
Aluminum wire
Steel wool
Water
Graduated cylinder
Weighing boat
Electronic scale
Beaker
Glass stirring rod
Tweezers
Paper towels
Funnel
Erlenmeyer flask
Paper filter
TAKE A PICTURE OF YOUR LAB STATION BEFORE YOU START.
AT THE END OF THE EXPERIMENT, RETURN THE LAB STATION TO ITS ORIGINAL STATE! 

14. Procedures:
Measure out an amount between g of CuCl2. Record the exact amount in your data table. Place it in your beaker.
Using a graduated cylinder, measure out 100mL of water and add this to your beaker with CuCl2.
Obtain a pre-cut piece of aluminum metal from your instructor. Find the mass of the aluminum and record the value in your data table.
Put the aluminum piece into the beaker with the copper solution (be careful not to make a splash!!!).