Question

Describe what is done in a displacement titration and give an Example

Short answer

When an analyte replaces a metal ion and results in formation of a complex. Then it is known as Displacement titration.

Displacement of Ni²⁺ from $\mathrm{Ni}{\left(\mathrm{CN}\right)}_4^{2-}$using the analyte Ag⁺. Then the displaced Ni²⁺is titrated by EDTA in order to determine the amount of Ag⁺present.

Step-by-step solution

EDTA

EDTA, also known as ethylenediaminetetraacetic acid forms strong complexes with metal ions and plays a major role in quantitative analysis. In industries it is used as a metal binding agent and used in production of detergents, cleaning agents, food additives etc. There are several types of EDTA titration techniques like direct titration, indirect titration, back titration, displacement titration, etc.

Displacement Titration

When an analyte replaces a metal ion from a complex and titrates with that displaced metal ion, then it is called displacement titration.

Example of Displacement Titration

Displacement of Ni²⁺ from $\mathrm{Ni}{\left(\mathrm{CN}\right)}_4^{2-}$using the analyte Ag⁺. Then the displaced Ni²⁺is titrated by EDTA in order to determine the amount of Ag⁺present