Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
Related questions
Question
Calculate the molarity of prepared solution?
Transcribed Image Text:1. prepare five nickel sulfate solutions of known concentration (standard
solutions).
2. Each is transferred to a small, rectangular cuvette that is placed into the
Colorimeter.
3. The amount of light that penetrates the solution and strikes the photocell is
used to compute the absorbance of each solution.
4. The concentration of an unknown N¡SO, solution is then determined by
measuring its absorbance with the Colorimeter.
5. Add about 30 mL of 0,40 M NISO, stock solution (10.51 g of NISO,•6H,O
per 100 mL) to a 100-mL beaker. I
6. Add about 30 mL of distilled water to another 100-mL beaker.
7. Label four clean, dry, test tubes 1-4 (the fifth solution is the beaker of 0.40
M NİSO,.
8. Pipet 2, 4, 6, and 8 mL of 0.40 M NİSO, solution into Test Tubes 1-4,
respectively.
9. With a second pipet, deliver 8, 6, 4, and 2 mL of distilled water into Test
Tubes 1-4, respectively.
10.Thoroughly mix each solution with a stirring rod. Clean and dry the stirring
rod between stirrings.
11.Keep the remaining 0.40 M N¡SO, in the 100-mL beaker to use in the fifth
trial.
12. Volumes and concentrations for the trials are summarized below:
13.Prepare a blank by filling an empty cuvette ¾ full with distilled water.
14.Seal the cuvette with a lid.
15.To correctly use a Colorimeter cuvette, remember:
• All cuvettes should be wiped clean and dry on the outside with a tissue.
17.Collect absorbance-concentration data for the five standard solutions.
18.Determine the absorbance value of the unknown N¡SO, solution.
OBSERVATIONS & CALCULATIONS
Trial
Concentration
Absorbance
1
0.080
0.16
0.24
0.32
2
3
5
0.40
Unknown number
mol/L
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