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Molar and Specific Heat Capacity

What volume o...

Question

What volume of $0.1 M N a O H$ will be required to neutralize $100$ mL of $0.1 M H_{3} P O_{4}$ using methyl red indicator to change the colour form pink (acidic medium) to yellow (basic medium)?

A

300

mL

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B

200

mL

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C

100

mL

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D

30

mL

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Solution

The correct option is C $100$ mL
Methyl red indicates first step ionisation of $H_{3} P O_{4}$ .
$H_{3} P O_{4} ⇌ H^{⨁} + H_{2} P O_{4}^{⊝}$
$n$ -factor $= 1$
$E w = \frac{M w}{1}$ and $N = M \times 1$
$N a O H \equiv H_{3} P O_{4}$
$N_{1} \times V_{1} = N_{2} \times V_{2}$
$0.1 \times 1 \times V_{1} = 0.1 \times 1 \times 100$
$V_{1} = 100$ mL

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