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In the classic activity comparing soap's foam in plain water vs hard water, more foam is generally produced in

Question
In the classic activity comparing soap's foam in plain water vs hard water, more foam is generally produced in
Hard water
Distilled/soft water
Equal foam in both cases
Neither produces any foam
Answer
Distilled/soft water
Detailed Explanation
Soap forms more foam in distilled/soft water than in hard water, where it reacts to form scum instead.
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