254 Crystallized Tin from solution. 



The hydrate of alumina weighed 25.25 grains. 23.125 grains of 

 this hydrate weighed after ignition 16.13 grains, whence the alumina 

 contained in the 25.25 grains of hydrate was 17.6559 grains. 



(B) The solution from which the alumina had been precipitated, 

 was evaporated, and the washings were added as there was room for 

 them in the evaporating dish. When reduced to the bulk of 2 or 3 

 gills, nitrate of silver was added in excess, to precipitate the muriatic 

 acid. The chloride of silver was treated as in the analysis of chlo- 

 ride of aluminium, and w^hen dry weighed 138.125 grains. A 

 quantity of this chloride weighing 135.5 grains was fused, and then 

 weighed 131 grains, when the 138.125 of dry chloride, =133.537 

 of fused chloride, =32.932 grains of chlorine.* 



(C) The alumina obtained was 17.6559 grains. If the combin- 

 ing proportions determined in the analys is of chloride of aluminium 

 be adopted, 17.6559 of aluminia, and 8.261 of aluminium are chem- 

 ical equivalents. The hydrated chloride analyzed weighed 129 

 grains, and the w^ater must be = 87.807 grains= 129 — (8.261 al. 

 +32.932 cl.) 



The liquid hydrated chloride of alumiiyum is then composed of 

 Chlorine, (B) 32.932 25.52=1 atom. 



Aluminium, (C) 8.261 6.40 = 1 atom. 



Water, (C) 87.807 68.08 = 10 atoms. 



129.000 100.00 



The balance used in this analysis was not a delicate one, like that 

 used in the analysis of chloride of aluminium, but it w^ould weigh 

 aV grain. 



The ratio of the chloride of silver and alumina obtained in this, is 

 not exactly the same as that in the analysis of the chloride of alu- 

 minium. 



In the former it is Cl. S. : :Mz. : : 100 : 13.22. 



In the latter it is Cl. S. : :^. : :100 : 14.47. 



III. Crystallized Tin from solution. 



During the month of March last, having occasion to form a solu- 

 tion of muriate of tin, some pure muriatic acid was poured upon an 

 excess of spongy grain tin. The solution was formed on the sand 



* 2.054974cl.s.+ : 0.506795cl.t : : 133.537cl.s. : x and x =3-2.932. 

 i Vide table a in the analj^sis of chloride of aluminium. 



