FACTORS THAT AFFECT THE LIGHT ABSORBED BY A TRANSITION METAL COMPLEX How does the concentration of Nickel Sulphate solution affect its absorbency of light?

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IB Chemistry

Year 12        d block Chemistry Investigation        Medora Choi

FACTORS THAT AFFECT THE LIGHT ABSORBED BY A TRANSITION METAL COMPLEX

How does the concentration of Nickel Sulphate solution affect its absorbency of light?

Hypothesis: As the concentration increases the absorbency increases.

Variables

Independent variable: Concentration of Nickel Sulphate Solution

Dependent variable: Absorbency of light

Controlled variable: Volume of Nickel Sulphate Solution

                                Light Wavelength

                                Light Intensity

                                Path Length

                                Type of Chemical Solution

Method:

Materials:

  • 1M Nickel Sulphate Solution (NiSO4(aq))
  • Deionized water
  • Graduated Pipettes (2, one for nickel sulphate, one for water)
  • Pipette Balls (2)
  • Cuvettes (10)
  • Beakers
  • Colorimeter
  • Non-Scratch Wipes
  • Glass Droppers
  • Computer
  • Launch Datastudio software
  • Labels

In this experiment concentration of the Nitrate Sulphate solution is being varied to determine effect on absorbency of light. These concentrations will be made from dilutions of Nitrate Sulphate solution provided. The dilutions are as follows:

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Making the dilutions:

  1. Use two graduated pipettes, one for the deionized water and the other one for the 1M Aqueous Nitrate Sulphate solution to make the dilutions of Nitrate Sulfate from the table above.
  2. Pour the water and the solution into a beaker and mix thoroughly.
  3. Use a glass dropper to take a sample from the dilution and store in one of the cuvettes, make sure there are no air bubbles.
  4. Use the same colorimeter throughout the experiment so that the path length would remain a constant value.

Setting up the Pasport colorimeter:

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