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On some of the Relations of Salts of Zinc and Alumina to Soda and Potassa. 
Br E. N. HORSFORD. 
( Communicated September 11, 1860.) 
On the addition of caustic soda to a solution of neutral sulphate of zinc there 
follows a precipitate which disappears in an excess of the soda. A solution of neutral 
sulphate of alumina exhibits under like conditions the same phenomena, and both salts 
comport themselves with potassa as they do with soda. Alumina is thrown down from 
its solutions in potassa and soda by chloride of ammonium and by mineral acids, while 
oxide of zinc is not in like manner precipitated from its solution in these alkalies. 
The following results present some of the quantitative relations of these agents to 
each other. | 
Experiments with Sulphate of Zinc. 
Strength of Solutions. 
1 cubic centimetre of the solution of sulphate of zinc contains 0.0257 gram. oxide of zinc, 
equal to 0.05108 gram. anhydrous sulphate of zinc. 
RON e soda solution contains 0.04313 gram. soda. 
A S potassa solution contains 0.0230 gram. potassa. 
Experiments with Soda. - 
ids : : 
Mr Nba dai 
ZnO . 805. Nad. Nao. 
5 c.c. 2.3 c. c. : 18 GE 
“ “ EE 
“ Ki “ 
113 “ “ 
“ EE “ 
Di “ Di 
Average, 5 c.c. 2.3 c. c. < 70 Ue 
