Why hardness is expressed in terms of Calcium carbonate equivalents(Lecture-3)

Engineering Chemistry Unit -1 ( Analysis Of Water).
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At 7:38 after getting the reason for the question I learnt that
1.Please don't judge till they complete.
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7:38
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[@vikashchauhan8793]

Standard hard water 342ppm ka kese bnaye or cacl2 and mgcl2 ka wt kese nikalte h plz tell

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[@indo10ment11]

What's the physical meaning of equivalent

[@ruchiupadhyay3687]

James smith the equivalent is the amount of a substance needed to do one of the following:
react with or supply one mole of hydrogen ions(H+) in an acid-base reaction.
react with or supply one mole of electrons in a redox reaction.
By this definition, an equivalent is the number of moles of an ion in a solution multiplied by the valence of that ion. If 1 mol of NaCl and 1 mol of CaCl2 dissolve in a solution, there is 1 equiv Na, 2 equiv Ca, and 3 equiv Cl in that solution. (The valence of calcium is 2, so for that ion you have 1 mole and 2 equivalents.)

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[@chetanairy256]

How 40+12+16*3=100 ????

[@ruchiupadhyay3687]

Ca=40
C=12
O*3=48
Total 100
Kindly calculate again.

[@vikashchauhan8793]

@@ruchiupadhyay3687 Mam plz batay
342 ppm ka hard water bnane k liye cacl2 and mgcl2 ka wt kese nikalte h
(1 liter 342 ppm ka hard water bnane k liye cacl2 0.304gm and Mgcl2 ka wt 0.139 gm lete but kese)