Question

What is selective precipitation? What are the conditions under which selective precipitation may occur?

Answer 1

Separation of ions in an aqueous solution by using a reagent that forms a precipitate with one of the ions is called selective precipitiation.f a chemical solution is a mixture of two salts, containing two different cations, but same anions, for example, Iron (ii) and silver.
When another outside compound like sodium chloride is added to this, one of the ions, silver ions, comes out of the solution in the form of a white precipitate, leaving behind iron and sodium ions. This is called as selective precipitation, where using another compound, a precipitating agent, one ion can be removed from the mixture.

When we need to precipitate certain ion from a solution,then we use selective precipitation.An reagent is introduced in a solution so that the ion which needs to be removed forms precipitate with ions of reagent and gets removed.