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Types of Redox Reactions

50 ml of a mi...

Question

$50 m l$ of a mixture of $N a O H$ and $N a_{2} C O_{3}$ titrated with $\frac{N}{10} H C l$ using phenolpthalein indicator required $50 m l$ of $H C l$ to decolourise phenolpthalein. At this stage methyl orange was added and addition of acid was continued. The second end point was reached after further addition of $10 m l$ of $\frac{N}{10} H C l$ . The amount of $N a O H$ in the solution is:

A

3.2g

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B

0.16g

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C

0.08g

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D

0.4g

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Solution

The correct option is B
0.16g

$1^{s t}$ titration

$M e q . o f N a O H + \frac{1}{2} M e q . o f N a_{2} C O_{3} = M e q . o f H C l = 50 \times \frac{1}{10} = 5$

$2^{n d}$ titration

$\frac{1}{2} M e q . o f N a_{2} C O_{3} = M e q . o f H C l = 10 \times \frac{1}{10} = 1$

$∴ M e q . o f N a O H = 5 - 1 = 4$

$W t . o f N a O H = \frac{4 \times 40}{100} = 0.16 g$

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Similar questions

25 m L

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