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BTEC Applied Science - Unit 2 - Colorimetry Assignment (Achieved DISTINCTION) £7.49
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BTEC Applied Science - Unit 2 - Colorimetry Assignment (Achieved DISTINCTION)
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Colorimetry assignment ● Achieved DISTINCTION ● Includes detailed evaluation ● Entire practical ~ method ~ aim ~ results ~ graphs ~ conclusion

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  • January 14, 2024
  • April 18, 2024
  • 5
  • 2023/2024
  • Essay
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Colorimetry

The aim of this practical is to prepare standard solutions by dilution, to calibrate the colorimeter
and then find the concentration of an unknown Cu 2+ solution.

To find the concentration of the unknown Cu 2+ solution, we began by switching on the colorimeter,
and ensured that the filter was set to 680nm (red filter). Six beakers were labelled as: 0.2 ; 0.4 ; 0.6 ;
0.8 ; 1.0. Using the table below as a guide, the Copper II solution and distilled water were both
measured using the pipettes.

Copper II concentration Volume of Copper Volume of distilled water
(moldm-3) (cm3) (cm3)
1.0 10.0 0.0
0.8 8.0 2.0
0.6 6.0 4.0
0.4 4.0 6.0
0.2 2.0 8.0
0.0 0.0 10.0


After filling the six beakers, the colorimeter was set to %Transmission. A cuvette was filled with 0.0
moldm-3 of the solution, while setting the %Transmission to 100%. The other cuvettes were also filled
with the other solutions and were placed into the colorimeter. The %Transmission was recorded for
each of the cuvettes. The 0.0 moldm-3 cuvette was regularly placed back into the colorimeter to
ensure that the %Transmission was still at 100%.

Then another cuvette was filled with the unknown solution - the absorbance and the %Transmission
were measured.

The experiment was repeated – this time, the filter was changed to the 590nm filter (orange filter).



Results:

Copper II 680nm RED Filter 590nm ORANGE Filter
Concentration Absorbance %Transmission Absorbance %Transmission
moldm-3
1.0 0.74 18 0.25 58
0.8 0.58 27 0.18 65
0.6 0.48 33 0.16 70
0.4 0.33 48 0.13 74
0.2 0.18 67 0.07 87
0.0 0.0 100 0.0 100




Unknown 680nm RED Filter 590nm ORANGE Filter

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