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Mole Concept

4 L of water ...

Question

$4 L$ of water is added to $6 L$ of a $2 M$ $H C l$ solution. What is the molarity of the resultant solution?

1.2 M

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8 M

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0.12 M

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0.8 M

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Solution

The correct option is A $1.2 M$
Given: $M_{1} = 2 M$ ; $V_{1} = 6 L$ and
$V_{2} = (4 + 6) L = 10 L$
As per the concept of dilution,
$M_{1} V_{1} = M_{2} V_{2}$
$\Rightarrow (2 \times 6) = M_{2} \times 10$
So, $M_{2} = 1.2$ M

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