Question

why is it essential to add dilute HCl before proceeding to the test for the basic radicals of group 2 ?

Answer 1

Hello

dilute HCl increasing the concentration of h + ions in the solution and hence suppresses the dissociation of H2S due to common Ion effect.

As a result of which the sulphide ions concentration is sufficient only to exceeds the solubility product of the sulphides of Group II cations.

Since the solubility products for the surface of groups 3rd and 4th cations is very high those cations are not precipitate out under the above conditions.

Thank you !

Answer 2

heya !!



Here is your answer ⤵️⤵️


It is essential to add dilute HCL before proceeding to the test for the basic radicals of group 2.

Reason :


It increase the concentration of ions of HCL.

hope my answer helps you