Add a few drops of sodium nitroprusside solution, make alkaline with ammonia, then saturate with ammonium sulphate crystals.
The reduction may be accelerated by the addition of some ammonium sulphate.
This is filtered off, washed with a saturated solution of ammonium sulphate and then dissolved in 0.2 per cent.
From this solution (after partial evaporation) alum crystals are obtained by the addition of potassium or ammonium sulphate.
Aldehyde gives a carmine red unaltered by ammonium sulphate.
Under this process ammonium nitrate is produced by the double decomposition of ammonium sulphate and sodium nitrate.
This plate absorbs more than 200 times its volume of hydrogen when electrolyzed in a solution of ammonium sulphate.
(25 to 37 cents) per unit of combined nitrogen cheaper than ammonium sulphate, and 3s.