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Question

For which one of the following neutralizations, would the indicator methyl red be useful?

A

N a O H + C H_{3} C O O H

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B

H C l + N H_{3}

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C

H C l + N a O H

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D

None of the above

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Solution

The correct option is B $H C l + N H_{3}$
An acid base indicator is a dye that changes colour when pH changes.
The indicator methyl red is used for the titration of strong acid against a weak base. $H C l$ is a strong acid and ammonia is a weak base.
$H C l + N H_{3} \to N H_{4} C l$ .

$N H_{4} C l$ is the salt of strong acid and weak base so the solution will have a pH > 7( $N H_{4}^{+}$ )is a weak acid so the suitable indicator would be methyl red (pH range 4.4-6.0)

Hence, they can be titrated by using methyl red indicator.

Option B is correct.

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