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In which method of determining total hardness of water is based on the premise that hardness producing substance react with soap and form insoluble compounds before lather is produced?

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In which method of determining total hardness of water is based on the premise that hardness producing substance react with soap and form insoluble compounds before lather is produced?

(a) Clark’s method

(b) Hehner’s method

(c) Versenate method

(d) EDTA method

I have been asked this question in examination.

My enquiry is from Chemical Characteristic of Water in section Quality of Water of Environmental Engineering

1 Answer

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Best answer
Correct option is (a) Clark’s method

Explanation: In Clark’s method, total hardness is found by determining the standard soap solution required to obtain permanent lather with the water sample of known volume.

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