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Question

What volume of 0.1 M NaOH will be required to neutralize 100 mL of 0.1 M H3PO4 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 H3PO4.
H3PO4H+H2PO4
n-factor=1
Ew=Mw1 and N=M×1
NaOHH3PO4
N1×V1=N2×V2
0.1×1×V1=0.1×1×100
V1=100 mL

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