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STATEMENT-1: In the acid-base titration ...

STATEMENT-1: In the acid-base titration involving strong base and weak acid, methyl red can be used as an indicator.
STATEMENT-2: Methyl red changes its colour in the pH range 4.2 to 6.3.

A

If both the statements are TRUE and STATEMENT-2 is the correct explanation of STATEMENT-1

B

If both the statements are TRUE AND STATEMENT-2 is NOT the correct explanation of STATEMENT-1

C

If STATEMENT-1 is TRUE and STATEMENT-2 is FALSE

D

If STATEMENT-1 is FALSE and STATEMENT-2 is TRUE

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the statements provided in the question, we will evaluate each statement based on our understanding of acid-base titrations and the properties of the indicator methyl red. ### Step-by-Step Solution: 1. **Understanding Statement 1**: - The first statement claims that in the acid-base titration involving a strong base and a weak acid, methyl red can be used as an indicator. - In such a titration, the equivalence point occurs at a pH greater than 7 (usually around 8 to 9). This means that the solution will be basic at the equivalence point. **Hint**: Recall that the equivalence point for strong base and weak acid titrations is above pH 7. 2. **Evaluating Methyl Red**: - Methyl red is an acid-base indicator that changes color in the pH range of 4.2 to 6.3. This means it is suitable for detecting pH changes in acidic solutions. - Since the equivalence point of a strong base and weak acid titration is above pH 7, methyl red will not effectively indicate the endpoint of this titration. **Hint**: Check the pH range of the indicator and compare it with the expected pH at the equivalence point of the titration. 3. **Understanding Statement 2**: - The second statement claims that methyl red changes its color in the pH range of 4.2 to 6.3. - This statement is indeed true as it accurately describes the pH range in which methyl red operates. **Hint**: Verify the color change range of methyl red from reliable sources or textbooks. 4. **Conclusion**: - Since Statement 1 is incorrect (methyl red cannot be used for strong base and weak acid titrations) and Statement 2 is correct (methyl red changes color in the specified pH range), we conclude that: - Statement 1: False - Statement 2: True ### Final Answer: - **Statement 1 is false and Statement 2 is true.**
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