Question

Can we use soaps and synthetic detergent to check the hardness of water?

Answer 1

Yes you can use soap and detergent to check hardness of water because soap will not dissolve in hard water while detergent will give foam and lather in hard water.
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Answer 2

hii friend

here's is your answer

soaps can be used but synthetic detergent cannot be used cannot be used with to check the hardness of water the hardness contain calcium and magnesium ions soaps get precipitated as insoluble calcium and magnesium soaps in hard water as scu m but detergent do not. synthetic detergent produce form in both soft and hard water. thus, soaps can be used but synthetic detergent cannot be used to check the hardness of water.

hope this information is sufficient for you and it helps you