The Solutions Challenge 1
Name:
I am challenging you to make a solution of 100.00 ml of 0.25 M CuSO4 that is so precisely made that
the masses of all the solutions made by the class are within +/- 0.01 g of each other.
Purpose: write a 1-2 sentence purpose in your lab book.
Pre-Lab Questions: write “Pre-Lab Questions” and underline it. Then write, in full sentences,
answers to the questions below.
1. Should you use a graduated cylinder, a beaker, or a volumetric flask to measure the volume?
Why?
2. Should you weigh the CuSO4 and then add 100 ml of water, OR should you weigh the CuSO4,
put it into the flask/beaker/cylinder and then add enough water to MAKE 100 ml total of
solution? Why is there a difference in these two methods?
Method
Write the method you will use to make your solution in your lab book. Include calculations that
show the amount of CuSO4 used. Check the bottle of CuSO4 to see if this is a hydrated compound. If
it is, the molar mass will be significantly affected.
Data
Group
Mass of 100.00 ml of
Solution
Results
3.
What is the density of 0.25 M CuSO4?
4.
Is this a saturated, unsaturated or supersaturated solution? How can you tell?
Conclusions
In 3-4 sentences write a conclusion. You might include answers to the following questions: How
did your group do at making the solution? What did you learn from this lab?
The Solutions Challenge 2
Name:
The last question on the gas laws quiz was:
(FR 2012)
You are to do this. However, I have rewritten the question so we can work with less concentrated
HCl.
The laboratory procedure specified that the concentration of the HCl solution be 0.50 M, but
only 3.0 M HCl solution was available. Describe the steps for safely preparing 50.0 mL of
0.50 M HCl (aq) using 3.0 M HCl solution and materials selected from the list above. Show
any necessary calculation(s).
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