What is the difference between double …

Double salt : (1.) They usually contain two simple solids in molecular portion. (2.) There exist only in solid state. In aqueous solutions dissociate completely into ions. (3.) There are ionic compounds and do not contain any co-ordinate bond. (4.) The properties of double salt are same as those of its constituent compounds. (5.) In a double salt the metal ions show their normal valency. (6.) A double salt loses its identity in the solution. Eg.: KCL.MgCl2.6H20, Mohar's salt. Complex salt : (1.) The simple Salt from which they are formed may or may not be equal proportions. (2.) They exist in the solid state as well as in aqueous solution. This is because even in the solution the complex ions does not dissociate into ions. (3.) They may or may not be ionic but the complex part always contain co-ordinate bonds. (4.) The property of coordination compound are different from its constituents. (5.) In a coordination compound the metal ions satisfy its two types of valency is called primary and secondary valencies. (6.) A coordination compound retains its identity in the solution. Eg.: K4[Fe(CN)6], [Cu(NH3)4]SO4.