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Equivalent Mass

100 mL of 0...

Question

$100$ mL of $0.2 M K_{2} C O_{3}$ requires $100$ mL of $0.2 M H C l$ using phenolphthalein as indicator. The volume of $0.2 M H C l$ required for $100$ mL of $0.2 M K_{2} C O_{3}$ using methyl orange as indicator is :

A

200

mL

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B

100

mL

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C

400

mL

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D

50

mL

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Solution

The correct option is D $200$ mL
Phenolphthalein is used only up to $K_{2} C O_{3} + H C l \to K H C O_{3} + K C l + H_{2} O$ .

So, it indicates upto $100$ mL $H C l$ only, while methyl orange is used for complete neutralisation and $H C l$ required here is,
$0.2 \times 100 \times 2 = 0.2 \times V$

$V = 200 m l$

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