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Standard VII

Chemistry

Litmus

Assertion :Ph...

Question

Assertion :Phenolphthalein is used as indicator during the titration of oxalic acid against sodium hydroxide. Reason: $p H$ range of phenolphthalein is from $8$ to $9.6$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
During the titration of oxalic acid against sodium hydroxide(strong base), there will be the formation of basic salt whose $p H$ ranges from $8$ to $10$ ,

Phenolphthalein is often used as an indicator in acid-base titrations. It will appear pink in basic solutions and clear in acidic solutions. It is known as the titrant.

Hence, phenolphthalein is chosen because it changes colour in a pH range between 8 – 9.6.

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Assertion :Phenolphthalein is used as indicator during the titration of oxalic acid against sodium hydroxide. Reason: pH range of phenolphthalein is from 8 to 9.6.

Assertion :Phenolphthalein is used as indicator during the titration of oxalic acid against sodium hydroxide. Reason: $p H$ range of phenolphthalein is from $8$ to $9.6$ .