Estimating the complex with chelating agent is ____.

Correct option is B

Explanation of the Correct Option (b): Complexometry
· Complexometry is an analytical method based on the formation of stable complexes between metal ions and chelating agents.
· The most commonly used chelating agent is EDTA (Ethylenediaminetetraacetic acid).
· This method is widely used to:
· Estimate metal ions such as Ca²⁺, Mg²⁺, Zn²⁺, Cu²⁺
· Determine water hardness
· Since the question refers to estimating a complex with a chelating agent, complexometry is the correct method.
Explanation of Other Options
Option (a): Precipitometry
· Involves formation of an insoluble precipitate.
· Does not involve chelating agents.
· Hence, incorrect.
Option (c): Argentometry
· A titrimetric method involving silver nitrate (AgNO₃).
· Used for estimation of halides (Cl⁻, Br⁻, I⁻).
· Not related to chelation.
Option (d): Thiocyanometry
· Involves titration with thiocyanate ions.
· Mainly used in silver determination.
· Not a chelating method.
Key Points Related to the Question
· Complexometric titration uses chelating agents.
· EDTA is the most common chelating agent.