23 
stronger water of ammonia of the U, S. Pharmacopoeia (sp. gr. 0.900 at 
15° 0.), producing in turn .47 pounds of the basic copper sulphate. 
MODIFIED EATT CELESTE. 
Formula .—Sulphate of copper, 2 pounds; carbonate of soda, 2-J 
pounds; strong ammonia, 1J pints; water, 22 gallons. In the addition 
of a solution of sodic carbonate to a solution of copper carbonate the 
copper is precipitated as a basic carbonate, forming at the same time 
a soluble sulphate of soda. 
Upon the addition of ammonia the basic carbonate dissolves to a blue 
fluid forming the ammonio-copper carbonate (Cu0O 3 , 2NH 3 ), and the 
ammonio-eupric hydroxide. (3Cu(OH) 2 , 4NH 3 , 3H 2 0.) 
In drying upon the plant both of these salts gradually lose their 
ammonia, and are converted into the basic carbonate and into the cupric 
hydroxide. 
The following are the probable reactions: 
(l) 12 (CuS0 4 , 5H-0) + 12 (NasCOs, 10H 2 O) = G [CuC0 3> Cu(OH) 2 , H 2 0] + 
Basic carbonate 
of copper. 
12Na 2 S0 4 +6C0 2 -fl68H 2 0 
(2) 6[CuC0 3 , CuC(0H) 2 ]+ 2QNH 4 H0=6(CiiC0 3 , 2NH 3 )+ 
To dissolve. Ammonio-copper 
carbonate. 
2[3Cu(OH) 2 , 4NH 3 , 3H 2 Q] +14H 2 0. 
Ammonio-cupric hy¬ 
droxide. 
(3) In drying npon the plant. 
6(CuC0 3 , 2NH 3 )+6H 2 Q=3[CuCQ 3 > Cu (OH) 2 ]-f- 3(NH-t) 2 C0 3 +6NH 3 
Basic carbonate of 
copper. 
2[3Cu(OH) 2 , 4NH 3 , 3H. 2 0]=t6Cu(0H) 2 +8NH 3 +6H 2 0. 
From the above formula it is found that to satisfy the reaction, the 
two pounds of copper sulphate will require 2.3 pounds of crystallized 
carbonate of soda, which will eventually produce .44 pounds of basic 
carbonate of copper and .38 pounds of the cupric hydroxide, or a total 
of .82 pounds of the mixed salts. 
AMMONIACAL COPPER CARBONATE. 
Formula .—Copper carbonate, 3 ounces; strong ammonia, 1 quart; 
water, 22 gallons. 
In the preparation of this solution, the chemistry is the same as that 
given under modified eau celeste and the reactions are given in for¬ 
mulae (2) and (3). 
