Which is the best choice for weak base-strong acid titration?

Methyl red

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Litmus

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Phenol red

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Phenolphthalein

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Solution

The correct option is A Methyl red
$p H$ curve of strong acid (say $H C l$ ) with a weak base (say $N H_{4} O H)$ is vertical over the pH range of 4 to 7.
So the indicators methyl red is suitable for such a titration as they change the acidic solution to red colour and they work in range of $p H = 4$ . to $6$

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Which is the best choice for weak base-strong acid titration?

The correct option is A Methyl redpH curve of strong acid (say HCl) with a weak base (say NH4OH) is vertical over the pH range of 4 to 7.So the indicators methyl red is suitable for such a titration as they change the acidic solution to red colour and they work in range of pH=4. to 6