AMMONIA NITRATE WITH AMMONIA. 
373 
Nitrates are soluble salts ; potassium slightly; sodium moderately; silver sparingly, 
the undissolved salt caking together ; lead freely, the solution behaving like that of 
the chloride ; and barium sparingly. 
The nitrites of potassium and sodium are sparingly soluble. 
Ammonia orthophosphate is almost insoluble, and is very slowly converted into a 
bulky substance (ammoniated ammonia phosphate ?). 
Sodium orthophosphate is insoluble ; so also is the calcium salt. 
Sodium pyrophosphate is also insoluble. 
Sodium metaphosphate is nearly insoluble. 
Hydrogen metaphosphate is almost insoluble. 
Borax slowly dissolves to some extent. 
Ammonia sulphate is quite insoluble. Other sulphates are either quite or nearly 
insoluble, but are nearly all of them decomposed with the production apparently of 
insoluble ammonia sulphate. When ammonia nitrate contaminated with sulphate is 
treated with ammonia gas, the sulphate is left undissolved or non-liquefied. 
Potassium sulphate is very slightly decomposed into ammonia sulphate, which pre- 
cipitates, and potassium nitrate, which dissolves ; a bare trace of the sulphate dissolves. 
Sodium sulphate is slowly and superficially converted into a bulky crystalline sub- 
stance, probably ammoniated ammonia sulphate. A trace of the sulphate dissolves and 
a little sodium (as nitrate). 
Silver , lead , magnesium , zinc, copper , and mercury sulphates are apparently converted 
into ammoniated ammonia sulphate and more or less completely soluble ammoniated 
metallic salts. 
Barium sulphate is insoluble. 
Calcium sulphate is converted into prismatic crystals. Only minute quantities of 
calcium compound and sulphate dissolve. The crystals are probably an ammoniated 
calcium salt. 
Manganous sulphate is converted into a very bulky substance. Only a trace of man- 
ganese dissolves and no sulphate. 
Ferrous sulphate (obtained by heating the green sulphate nearly to redness in an 
atmosphere of hydrogen, and apparently pure) is converted into a very bulky substance 
of a light chocolate-brown colour. The liquid takes up a very little ferrous compound, 
but no sulphate. (The colour of the substance deposited is perhaps due to the pre- 
sence of a little ferric salt: see ferrous and ferric chlorides.) 
Alum is very slowly converted into a bulky substance. The liquid dissolves out a 
very little aluminic salt, which by water is thrown down as aluminium hydrate and a 
mere trace of sulphate. 
Chromium alum instantly assumes a rich deep green colour, and very slowly imparts 
a rose-pink colour to the liquid, while a deposit of the same colour gradually forms. 
The liquid dissolves out potassium salt and a trace of sulphate. The deposit is soluble 
in water, and gives a violet-pink solution : this solution, or the pink liquid itself when 
mdccclxxiii. 3 D 
