1. Molarity and Dilutions Pre-Lab Calculations & Questions

2. Take out a piece of paper.  You will get into groups of 3-4 students. Pick your groups wisely  Write all your group members names on the top of the paper.  Answer the following questions on the paper.  You MUST get my signature next to each question before moving on.

3. PART A - Pre-Lab Questions and Calculations 1.What is the formula for Copper sulfate pentahydrate? 2.What is the molar mass of Copper sulfate pentahydrate? (carry to 2 dp) 3.What is your assigned molarity for the lab? (you get this # from Mrs. Hill) 4.How many moles of Copper sulfate pentahydrate will you need to make 100mL of solution? 5.How many grams of Copper sulfate pentahydrate will you need? (carry to 2 dp)

4. PART A - Procedure  Now write a detailed step-by-step procedure on how you will make 100mL of solution in the molarity Mrs. Hill assigned you.  Minimum of 3 steps.  Make it so easy/clear that some one who has never taken chemistry could follow it.

5. PART B - Pre-Lab Questions and Calculations 6.What is the molarity you will need to dilute your solution too? (you get this # from Mrs. Hill) 7.Calculate the volume of stock (starting solution) you will need to make 100mL of diluted solution. 8.Write your procedures

6. PART B - Procedure  Now write a detailed step-by-step procedure on how you will make 100mL of the diluted solution in the molarity Mrs. Hill assigned you.  Minimum of 3 steps.  Make it so easy/clear that some one who has never taken chemistry could follow it.

7. Post Lab Questions 1.Write the formulas for molarity and dilution. 2.List all of the materials/equipment you used for the lab. 3.Calculate the numbers of moles required to make 100mL of a 3.0M CuSO 4 ●5H 2 O 4.Calculate the numbers of grams required to make 100mL of a 4.5M CuSO 4 ●5H 2 O

8. Post Lab Questions Continued 5.How many mL of a 2.0M stock Solution would be needed to make 100mL of a 0.75M solution? 6.Compare the colors of your stock and diluted solutions, is this what you would expect? 7.If you carefully poured the two together, without mixing them, which would you expect to find on the top layer and which on the bottom?