Question

Which chemical is used as an indicator in determining the purity of sodium chloride?

• A. Potassium chromate
• B. Potassium permanganate
• C. Silver nitrate
• D. Silver chloride

Hint:

Silver nitrate is commonly used as an indicator in chloride titrations to determine the purity of sodium chloride.

Answer 1

The Correct Option is C

Step 1: Understanding the Role of the Indicator
- When determining the purity of sodium chloride, an indicator is used to detect the end point of the titration. This involves detecting chloride ions in the sample. - Silver nitrate is commonly used in titrations to form a precipitate with chloride ions, which can help determine the chloride content and, therefore, the purity of sodium chloride.

Step 2: Explanation of Other Chemicals
- Potassium chromate and potassium permanganate are used in other types of titrations, but not for sodium chloride purity testing.
- Silver chloride is a product formed when silver nitrate reacts with chloride ions, but it is not used as the indicator itself.

Step 3: Conclusion
The correct answer is (C) Silver nitrate, which is used to test for chloride ions during titration.