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Molarity

0.2 mole of ...

Question

$0.2$ mole of $H C l$ and $0.2$ mole of barium chlorine were dissolve in eater to produce a $500 m l$ solution. The molarity of the $C l^{-}$ ions is:

0.06 M

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0.09 M

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1.2 M

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0.80 M

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Solution

The correct option is C $1.2 M$
Total moles of $C l^{-}$ ions $= 0.2 \times 1 + 0.2 \times 2 = 0.6$
$V o l u m e = 500 m l$
$∴ [C l^{-}] = \frac{0.6 \times 1000}{500} = 1.2 M$

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