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The hardness of a water sample containing $10^{- 3} M M g S O_{4}$ expressed as $C a C O_{3}$ equivalents (in ppm) is 25x, then 'x' is____

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answer is 4.

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Detailed Solution

1 Litre has $10^{- 3}$ moles $M g S O_{4}$
So, 1000 litre has 1 mole $M g S O_{4}$ = 1 mole $C a C O_{3} = 100 p p m$

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