Can you use chalk to remove soap in water?

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shimmy88 asks:

Since chalk is calcium sulfate, it reacts within the laundry water, which is hard water. The calcium sulfate is supposed to remove the soap in the water. BUT how do you prove that the soap is out of the water? Can you use a coffee filter... or is there another way to tell that the soap is COMPLETELY gone.

In Topics: Helping my child with science

> 60 days ago

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Answer

Expert

greenprof2

May 6, 2011

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What the Expert Says:

I think that you could test the pH of the water. Soap is an alkali, pH above 7. If the pH of your water is neutral (7) or less, then you can conclude that the soap is removed.

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