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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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Introduction

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: Concentration of NiSO4(aq) (mol dm-3) Volume of 1M Aqueous NiSO4 Solution (cm3) Volume of deionized water(cm3) ...read more.

Middle

When the green light is not blinking, it should be lit and steady. 15. Click 'Start' on the software. If the colorimeter is not calibrated to zero, start again. Testing it would ensure that there will be no systematic error in the results and the readings would be accurate. Using the colorimeter and collecting data: 16. Insert the cuvette with one that has 1.00 mol dm-3 NiSO4 solution. 17. Press 'Start' on the software. 18. A horizontal line at the level of absorbance should appear on the graph. 19. To show only the reading, click on 'Meter'. 20. Record the reading on the data table. 21. Repeat steps 9, 16-20 for the 9 other cuvettes of different dilutions. 22. Results will be recorded on a table. The mean average of the absorbency will be calculated later.Plot these values onto a graph using the Microsoft Excel computer programme. Data & Results Rough Collected Data Concentration of NiSO4 (mol dm-3) (see Graphs and Calculations for Uncertainties) ...read more.

Conclusion

In the hypothesis it was stated that according to the prediction the graph would approximately resemble the graph drawn below (right). The real graph is shown below (left). They are similar: The accuracy of the results however does not conclude the hypothesis. The errors were relatively small and appear to be random however; the trend line does not fall within the error bars on the graph, meaning the few sets of results could change the accuracy of the investigation. These errors are not ideal; hence, more repetitions of the data would most likely have eliminated these after multiple repetitions. These are probably small human errors which would not be eliminated by changing the apparatus used. In all this experiment, it proved the hypothesis; hence, it was a success as we could draw firm conclusions from the data generated. In the future, further work could be done to expand our knowledge of transition metal complexes and their light absorbing qualities by experiment on different variables. ?? ?? ?? ?? IB Chemistry Year 12 d block Chemistry Investigation Medora Choi ...read more.

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