420 ELEMENTARY CHEMICAL MICROSCOPY 
III. Nitric Acid produces an Amorphous or Granular Pre¬ 
cipitate. 
Molybdate. 
Silicate. 
Tungstate. 
Titanate. 
Zirconate. 
Note. — It must be remembered that the addition of strong 
nitric acid will cause a crystalline precipitate in the case of many 
salts of low solubility. 
A somewhat better scheme of separation of the acids has been 
proposed by C. G. Hinrichs^ based upon the behavior of their 
salts toward acetic and sulphuric acids when heated. ' 
Group I. — Salts which when heated with strong acetic acid 
are decomposed and certain components are volatilized. 
Carbonate (CO2). 
Cyanide (HCN). 
Hypochlorite (to Cl). 
Hyposulphite (SO2). 
Nitrite (oxides of N). 
Sulphide (H2S). 
Sulphite (SO2). 
Group //. — Salts which when heated with strong sulphuric 
acid are decomposed and certain components are volatilized. 
Acetate (HC2H3O2). 
Borate (B(OH)3). 
Bromide (HBr). 
Chlorate (HCIO3). 
Chloride (HCl). 
Cyanate (CO2 and NHg, latter forms (NH4)2S04). 
Ferrocyanide (HCN). 
Ferricyanide (HCN). 
Iodide (HI). 
Nitrate (HNO3). 
* Hinrichs, Microchemical Analysis, p. ii6,,St. Louis, 1904. 
