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Equivalent Mass

To 50 ml of a...

Question

To 50ml of a HCl solution, 25ml of 0.5N $N a_{2} C O_{3}$ solution is added. The remaining acid required 20cc of 0.5N NaOH solution for complete neutralization. The normality of the acid solution is

0.9N

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0.45N

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0.225N

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1.45N

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Solution

The correct option is B 0.45N
Milliequivalents of acid = Milliequivalents of $N a_{2} C O_{3}$ + Milliequivalents of NaOH
$50 \times N = (25 \times 0.5) + (20 \times 0.5)$
N = 0.45N

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