70 Preparation of Substances 



en a small scale suitable for laboratory pur- 

 poses. The Woburn Bordeaux, if enlarged 

 to barrel proportions, would consist of 4|- 

 ounces of copper sulfate, 4| gallons of lime- 

 water in 51 gallons of the mixture. 



Several compounds of copper can be made 

 by mixing lime and copper sulfate in different 

 amounts. The following symbols* show the 

 proportions present in the various substances 

 that can be formd: 



(I) CuS04.3CuO. (II) CuS044CuO. 

 (Ill) CuS04.9CuO.CaS04. (IV) CUSO4. 

 9CuO.CaS04-3CaO. (V) CuO-SCaO. 



It will be noted that the compound (II) is 

 more basic than (I) and that the basicity 

 increases progressively so that (V) is all base. 

 The compounds are produced successively, 

 by using increased quantities of lime-water 

 with the same amount of copper sulfate. 

 For example, with 0.5 gram of copper sulfate, 

 70 cc. of lime-water will produce the com- 

 pound CuS04'3CuO, 74.1 cc. of lime-water 

 will give CuS04-4CuO and 83.3 cc. of lime- 

 water will make CuS04.9CuO.CaS04. Wo- 

 burn Bordeaux may be any one of these 



* Taken from the 11th Annual Report (p. 25) of the 

 Woburn Experimental Fruit Farm by the Duke of Bed- 

 ford and Mr. Pickering. Some calcium sulfate is reported 

 united with the first three compounds in addition to that 

 represented. 



