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Total hardness of water can be determined by titrating the fixed volume of water against the standard ___________ solution.

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Total hardness of water can be determined by titrating the fixed volume of water against the standard ___________ solution.

(a) Soap

(b) Alkaline soap

(c) Acidic soap

(d) Alcoholic soap

I have been asked this question in an online interview.

My doubt stems from Estimation of Hardness topic in division Water of Applied Chemistry

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Right choice is (d) Alcoholic soap

Explanation: Total hardness of water can be determined by titrating the fixed volume of water against the standard alcoholic soap solution.

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