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Concentration Terms - An Introduction (w/w etc)

A water sampl...

Question

A water sample of 1 litre contains 81 mg of Ca( ${H C O}_{3}$ ) $_{2}$ ,111mg of ${C a C l}_{2}$ and 9.5mg of ${M g C l}_{2}$ . Its hardness will be

160ppm

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320ppm

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201.5ppm

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200ppm

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Solution

The correct option is A
160ppm

81mg of Ca( ${H C O}_{3}$ ) $_{2}$ = 50ppm; 111mg of ${C a C l}_{2}$ = 100ppm

9.5mg of ${M g C l}_{2}$ = 10ppm

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