Coordination Compounds
2.0 Addition Salt
2.0 Addition Salt
It is observed that when the solution of two or more neutral compounds are mixed in stoichiometric proportion and are allowed to stand overnight, a solid is formed. Such a salt is called addition salt.
Addition Salt are classified into two types:
1. Double Salt
2. Complex Salt
Double Salt: Double salt are those moleculer compounds which exist only in crystal lattices or quite stable in solid form but dissociate into ions in their aqueous solutions. They give the test of all of its constituent ions.
Example:
$\begin{equation} \begin{aligned} 1.{\text{ }}CARNALLITE = KCl.MgC{l_2}.6{H_2}O \\ 2.{\text{ }}MOHR{\text{ }}SALT = FeS{O_4}.{(N{H_4})_2}S{O_4}.6{H_2}O \\ 3.{\text{ }}POTASH{\text{ }}ALUM = KAl{(S{O_4})_2}.12{H_2}O \\\end{aligned} \end{equation} $
Complex Salt: Co-ordination compounds are those molecular compounds which are stable in solid state but does dissociate into ions in the aqueous solutions. They does not give the test of all of its constituent ions.
Example: ${K_4}\left[ {Fe{{(CN)}_6}} \right]$ which does not dissociate into ${\left[ {Fe(C{N_6})} \right]^{4 - }}$ and again into $F{e^{2 + }}$ and $C{N^ - }$ ions.
