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Ways of Representing the Concentration of a Solution

20 ml of 0.2 ...

Question

20 ml of 0.2 M ${A l}_{2} {({S O}_{4})}_{3}$ is mixed with 20 ml of 6.6 M $B a {C l}_{2}$ , the concentration of ${C l}^{-}$ in solution is:

0.2 M

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6.6 M

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0.02 M

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0.06 M

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Solution

The correct option is D 6.6 M
Conc. of $C l^{-}$ = $\frac{m o l e s o f C l^{-}}{t o t a l v o l u m e}$
= $\frac{2 \times 6.6 \times 20 \times 10^{3}}{(20 \times 10^{3}) + (20 \times 10^{3})}$
= 6.6 M

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