4. Discussion

3.1 Analysis of results:
-The polyester used in our experiment, is composed of loosely bound fibres, and therefore, allowed a high amount of light to pass through. Test results suggests the most amount of stain was removed with 2ml of detergent in a washing machine with 1500ml of water, for polyester.
-Test results for acetate shows the highest amount of stain was removed when using 3ml of detergent in a washing machine with 1500ml of water.
-Test results for cotton shows that 1ml, 2ml, 4ml, and 5ml of detergent are equally effective at removing stains, when washed in a washing machine with 1500ml of water.


3.2 Key findings
Test results suggests increasing the concentration of detergent does not necessarily clean the cloth more efficiently and it depends on what type of cloth we are washing.


3.3 Explanation of key findings
From our results:
-Polyester: The more detergent is used, the cleaner it is, until test 3 onwards, with 3ml of detergent, the results remained nearly the same.
-Acetate: test 1 and test 2, both 1ml and 2ml of detergent respectively, the cloth is actually dirtier, with the amount of light passing through lesser than the original control. From test 3, the results stayed almost the same. This means that using too little detergent for acetate does not wash the cloth thoroughly enough.
-Cotton: For cotton, all results are almost the same throughout, other than test 3, with 3ml of detergent. When 3ml of detergent is used, there is a decrease in the amount of stains removed
 
3.4 Evaluation of Hypothesis
-Our hypothesis is that detergent is acidic, and therefore will remove the permanent marker ink stain from fabric, since acid is capable of removing things easily. We predicted wrongly, since although there were effects by the detergent, onto the stained fabrics (when we compare the washed fabric test results with the control test results), the detergent did not completely remove the stain on any of the tests.


3.5 Areas for improvement
1.Record the results of all 3 tests and plotted more information in the report, instead of calculating the average without recording individual test results.
2.Did more tests with a larger variety of concentration of detergent, to reduce narrowing of information recorded, which might have unintendedly missed important patterns only visible when more data is compared.
3.Design mechanism to apply same amount of force ensure correct number of strokes, to reduce human error.
4.Wash all tests with water of constant temperature, since solubility varies according to temperature.
5.Usage of a more typical and common washing machine, instead of a small and unconventional washing machine, as a full-size washing machine is significantly more powerful.

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