Question

For the titration of \( \text{KOH} \) vs \( \text{(COOH)}_{2} \cdot 2\text{H}_{2}\text{O} \), the suitable indicator is:

• A. methyl orange
• B. phenolphthalein
• C. methyl red
• D. All can be used

Hint:

Strong Base + Weak Acid $\rightarrow$ Use Phenolphthalein.

Answer 1

The Correct Option is B

Step 1: Concept
In titrations, the indicator must change color at the pH of the equivalence point.
Step 2: Analysis
$\text{KOH}$ is a strong base and oxalic acid is a weak acid. The equivalence point will be in the alkaline range.
Step 3: Conclusion
Phenolphthalein is suitable as it changes color in the alkaline medium.
Final Answer: (B)