During the titration of a mixture of Na₂CO₃ and NaHCO₃ against HCI

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Methyl orange is used to detect the first end point

Methyl red is used to detect the first end point

Phenophthalein is used to detect the first end point

Phenophthalein is used to detect the second end point

answer is C.

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Detailed Solution

Phenolphthalein is used to get first end point. only Na₂CO₃ reacts with Hcl to form NaHCO₃ upto first end point
Na₂CO₃ +HCl → NaHCO₃ +NaCl
Phenolphthalein cannot be used for NaHCO₃ titration

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