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Types of Redox Reactions

50 mL of a so...

Question

$50$ mL of a solution containing $1$ g each of ${N a}_{2} C O_{3}$ , $N a H C O_{3}$ and $N a O H$ was titrated with $1 N H C l$ . The titre readings (in mL), if only methyl orange is used as an indicator from the beginning, will be $(20 + x)$ . Find the value of $x$ (as nearest integer).

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Solution

The end point using methyl orange when $1$ end point using phenolphthalein has already been detected, consumes half Meq. of ${N a}_{2} C O_{3}$ and complete $N a H C O_{3}$ .
$\frac{1}{2}$ Meq. of ${N a}_{2} C O_{3}$ +Meq. of $N a H C O_{3} =$ Meq. of $H C l$
$\frac{1}{2} \times \frac{1}{53} \times 1000 + \frac{1}{84} \times 1000 = 1 \times V_{3}$
$V_{3} = 21.3 m L$
So, nearest integer is $21$ .

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