After ignition, it is allowed to cool in a desiccator and then weighed.
The green salt appears to dissociate in aqueous solution into two ions, namely CrC1 2 (OH 2) 4 and one chlorine ion, since practically only one-third of the chlorine is precipitated by silver nitrate solution at o° C. Two of the six water molecules are easily removed in a desiccator, and the salt formed, CrC13.4H20, resembles the original salt in properties, only one-third of the chlorine being precipitated by silver nitrate.
Concentration of the aqueous solution in a desiccator gives a deposit of crystals of a very deliquescent salt, H21n2(S04)4.8H20.
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