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Statement-1:Phenolphathalein can be used...

Statement-1:Phenolphathalein can be used as indicator in the titration of weak acid with NaOH.
Statement-2 :Near the end point in the titration of weak acid with NaOH, the pH of the solutions is alkaline due to hydrolysis of anion.

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1

B

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1

C

Statement-1 is False, Statement-2 is True.

D

Statement-1 is True, Statement-2 is False.

Text Solution

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The correct Answer is:
To analyze the statements provided in the question, we will break down each statement and evaluate their correctness. ### Step-by-Step Solution: 1. **Understanding Statement-1**: - **Statement**: "Phenolphthalein can be used as an indicator in the titration of weak acid with NaOH." - **Explanation**: Phenolphthalein is a pH indicator that changes color in the pH range of approximately 8.2 to 10.0. In the titration of a weak acid (HA) with a strong base (NaOH), the pH at the equivalence point is typically above 7 (alkaline). Therefore, phenolphthalein is suitable for this titration as it will change color when the solution becomes alkaline. 2. **Understanding Statement-2**: - **Statement**: "Near the end point in the titration of weak acid with NaOH, the pH of the solutions is alkaline due to hydrolysis of anion." - **Explanation**: At the equivalence point of the titration of a weak acid with a strong base, the resulting solution contains the salt of the weak acid and NaOH. The anion from the weak acid (A-) can undergo hydrolysis, reacting with water to produce hydroxide ions (OH-), which makes the solution alkaline. This confirms that the pH is indeed alkaline due to the hydrolysis of the anion. 3. **Conclusion**: - Both statements are correct and Statement-2 provides a valid explanation for Statement-1. Therefore, the answer to the question is that both statements are true and the second statement correctly explains the first. ### Final Answer: Both Statement-1 and Statement-2 are correct.

To analyze the statements provided in the question, we will break down each statement and evaluate their correctness. ### Step-by-Step Solution: 1. **Understanding Statement-1**: - **Statement**: "Phenolphthalein can be used as an indicator in the titration of weak acid with NaOH." - **Explanation**: Phenolphthalein is a pH indicator that changes color in the pH range of approximately 8.2 to 10.0. In the titration of a weak acid (HA) with a strong base (NaOH), the pH at the equivalence point is typically above 7 (alkaline). Therefore, phenolphthalein is suitable for this titration as it will change color when the solution becomes alkaline. ...
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