Question

would you be able to check if water is hard. how?

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Answer 1

Answer:

There will be a instrument which measures the salt content and by more hard content we can say water is hard

Answer 2

Detergent are sulphonate salts and ammonium salt of long chain of the carboxylic acids and unlike soap which are not get react with the calcium and also magnesium in present in the part of the hard water to form the scum.