Ammonium Chloride at Frankston. 



137 



Production of Ammonium Chloride. 



Some experiments were carried out with a view to ascertaining' 

 the yield of ammonium chloride from slow combustion of sample B. 

 It was not, of course, possible to reproduce the conditions prevail- 

 ing at Frankston. 



A short, hard glass tube was filled with material. Owing to 

 difficulty in absorbing the products from large amounts, it was 

 necessary to work with only five grammes at a time. The sample, 

 heated from the outside, was slowly burnt in a current of air. 

 The current carried the products of combustion through a long 

 tube in which were spaced twelve wet glass-wool plugs, and then 

 through a bubbler containing water. All visible smoke or fume 

 was removed before the last plug was reached. Care was taken 

 to make the combustion complete, and to prevent condensation of 

 products in the hard glass tube. The plugs in the long tube were 

 pushed together, and washed with hot distilled water until free from 

 chloride. The washings, together with the water from the bubbler, 

 were made alkaline with potassium hydroxide free from chloride, 

 and evaporated to dryness. The residue was very gently ignited, 

 the solution then acidified with nitric acid, filtered and precipi- 

 tated with silver nitrate. The silver chloride was weighed in a 

 Gooch crucible. Calculating the chloride as ammonium chloride, 

 the amount of the latter obtained was equal to 0.092 per cent, of 



