One litre of hard water contains $1 m g$ $C a {C l}_{2}$ and $1 m g$ $M g {S O}_{4}$ . Find the hardness of water sample (in ppm)

1.734 p p m

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1.934 p p m

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1.534 p p m

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1.354 p p m

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Solution

The correct option is A $1.734 p p m$
Hardness in ${C a C O}_{3}$ in $p p m$ $= \frac{(w e i g h t o f s u b s t a n c e i n m g / l i t \times m o l . w t o f {C a C O}_{3})}{m o l . w t o f s u b s t a n c e}$
Hardness of ${C a C l}_{2} = \frac{1}{111} \times 100 = 0.9009$
Hardness of ${M g S O}_{4} = \frac{1 \times 100}{120} = 0.833$
total $\approx 1.734 p p m$

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