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The following procedure was used to test water hardness - HSC - SSCE Chemistry - Question 8 - 2016 - Paper 1
Question 8
The following procedure was used to test water hardness. • 5.0 mL of hard water was placed in a test tube. • 0.1 mL of liquid soap was added to the test tube. • The... show full transcript
Worked Solution & Example Answer:The following procedure was used to test water hardness - HSC - SSCE Chemistry - Question 8 - 2016 - Paper 1
Step 1
What would be a suitable control to use with this procedure?
Answer
A suitable control for this experiment would be to replace the hard water with distilled water (Option D). Distilled water is free from minerals and other impurities, which allows for the assessment of the effect of hard water on soap performance without interference from other variables. By comparing the bubble height formed with hard water to that with distilled water, the experiment can effectively highlight the impact of water hardness on soap efficacy.