Preparation And Analysis Of Aqueous Solutions.
Part 1:
1. Calculate the mass of solid sodium chloride necessary to prepare 10.0 mL of a 1.00 M NaCl(aq) solution. Show your work here:
2. Part 1 data:
|
Mass of volumetric flask (g)
|
9.7989g
|
|
Mass of volumetric flask + solution (g)
|
19.97g
|
|
Mass of solution (g)
|
0.58g
|
What is the density of your solution?
3. Obtain the true value for the density of your solution from your instructor. Calculate your percent error, showing your work below
TRUE VALUE GIVEN FROM INSTRUTOR IS 1.031g/ml
Part 2:
1. Calculate the mass of solid Copper (II) Sulfate pentahydrate necessary to prepare 10.0 mL of a 0.4 M CuSO4(aq) solution. Show your work here:
2. Calculate the amount of stock solution and water you will need for each of the dilutions and fill in the following table.
|
Solution #
|
0.40 M CuSO4 (mL)
|
DI water (mL)
|
Total Volume (mL)
|
Concentration (M)
|
|
1
|
0.3ml
|
2.7ml
|
3.0
|
0.040
|
|
2
|
0.6ml
|
2.4ml
|
3.0
|
0.080
|
|
3
|
1.2ml
|
1.8ml
|
3.0
|
0.16
|
|
4
|
1.8ml
|
1.2ml
|
3.0
|
0.24
|
|
5
|
2.4ml
|
0.6ml
|
3.0
|
0.32
|
|
6
|
3.0
|
0
|
3.0
|
0.40
|
Show an example dilution calculation for solution #3 here:
3. Using your data, fill in the following table:
|
Solution #
|
Concentration (M)
|
Absorbance
|
|
1
|
0.040
|
0.091
|
|
2
|
0.080
|
0.204
|
|
3
|
0.16
|
0.339
|
|
4
|
0.24
|
0.472
|
|
5
|
0.32
|
0.681
|
|
6
|
0.40
|
0.831
|
|
Unknown
|
?
|
0.348
|
4. Use your Beer's law curve to determine the concentration of the unknown CuSO4 solution:
M CuSO4: ___________
Show your work here:
5. Discuss sources of systematic error in this experiment.