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Molarity

The molarity ...

Question

The molarity of $S O_{4}^{2 -}$ ion in an aquecous solution that contain $34.2 p p m$ of ${A I}_{2} {({S O}_{4})}_{3}$ .(Asssume complete dissociation and density of solution is $1 g / m L$ ) is :-

3 \times 10^{- 4}

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2 \times 10^{- 4}

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10^{- 4}

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n o n e o f t h e s e

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Solution

The correct option is A $3 \times 10^{- 4}$
Hardness= $M \times 10^{5}$
$M = \frac{H a r d n e s s}{10^{5}} = \frac{34.2}{10^{5}} = 3 \times 10^{- 4} M$ .

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