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THE ROYAL SOCIETY OF CANADA 

 Table VI 



It appears from these results that the presence of ammonium 

 chloride is beneficial in lowering the solubility of the precipitate under 

 the above conditions, only about 1 mg. of iron, reckoned as oxide, 

 remains in the mother liquor. 



Summary 



From the above experiments we can conclude : 



1. That the cupferron precipitate of iron is slightly soluble in the 

 acid solution from which it is precipitated. The solubility is appar- 

 ently not affected by the substitution of sulphuric acid for hydro- 

 chloric. This solubility is appreciably lowered by adding ammonium 

 chloride to the solution, from which precipitation takes place. 



