Question

In complexometric titration, the masking agent used to mask Iron (II) ion

• A. KCN
• B. Thio glycerol
• C. Tri ethanol amine
• D. Ammonium Fluoride

Hint:

KCN is an effective masking agent for Iron (II) ions in complexometric titrations due to stable complex formation.

Answer 1

The Correct Option is A

- In complexometric titrations, masking agents are substances that selectively bind to certain metal ions to prevent them from interfering with the titration of other metal ions.
- Potassium cyanide (KCN) is commonly used as a masking agent for Iron (II) ions because it forms a very stable complex with Fe\(^{2+}\), effectively "masking" it.
- This prevents Fe\(^{2+}\) from reacting with the titrant, allowing accurate determination of other metal ions in the solution.
- Other options like thioglycerol, triethanolamine, and ammonium fluoride have masking properties for different ions but are not typically used for Fe\(^{2+}\).