You are given with $500 m L$ of $2 N$ $H C l$ and $500 m L$ of $5 N$ $H C l$ solutions. What is the final normality, if we mix these two solutions?

1.5 N

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3.5 N

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2.5 N

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4.5 N

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Solution

The correct option is B $3.5 N$
$500 ml of 2 N HCl$ :
Molarity $= 2 M$
No of moles $= 2 \times 0.5 = 1 m o l e$

$500ml of 5N HCl$ :
Molarity $= 5 M$
No of moles $= 5 \times 0.5 = 2.5 m o l e s$

Total moles $= 3.5 m o l e s$

Total volume $= 500 + 500 = 1000 m l = 1 L$

Normality = $\frac{3.5}{1} = 3.5 N$

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