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Molarity

0.2 mole of ...

Question

$0.2$ mole of $H C l$ and $0.2$ mole of $B a {C l}_{2}$ when dissolved in water to produce $750 m l$ of solution calculate molarity of $C l^{-}$ ion.

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Solution

Total mass of $C l^{-}$ ions $= 0.2 \times 1 + 0.2 \times 2 = 0.6 m o l$
Total volume $= 0.75 L$
$∴$ Molarity of $C l^{-}$ ions $= \frac{0.6}{0.75} = 0.8 M$

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