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Which acid-base indicator will give the best results for the titration of an aqueous ammonia solution with 0.10 M $H C I$ ?
Indicator Colour Change pH range
Methyl violet $red ⟶ blue$ $0 ⟶ 2$
Methyl red $red ⟶ yellow$ $4 ⟶ 6$
Cresol red $yellow ⟶ purple$ $7 ⟶ 9$
Phenolphthalein $colourless ⟶ pink$ $8 ⟶ 10$

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Methyl red

Methyl violet

Cresol red

Phenolphthalein

answer is B.

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Detailed Solution

When evaluating the $p H$ variations in acidic solutions, methylene red is helpful.

At end point, $pH < 7 .$

Hence, methyl red is most suitable.

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