1871.] 



Action of Metals and Liquids. 



327 



Crystallized Boracic Acid. 

 The hot plate was positive. A series of six solutions was employed, 

 containing from 50 grains to nearly 400 grains in 20 ounces by measure 

 of water, the strongest being a saturated solution. The currents obtained 

 were extremely feeble, and the plates were not tarnished. 



Aqueous Hydrofluosilicic Acid. 



Value of deflection '1488. The hot plate was negative, and became a 

 little tarnished. 



Pure Sulphuric Acid. 



No. 

 1. 

 2. 

 3. 

 4. 

 5. 

 6. 

 7. 

 8. 



Ounces of strong acid 

 diluted to 20 ozs. 



Value of 

 Deflection. 



•0077] 

 •0161 



•0878 ' plate was nega- 



•1044 ^ ve > an< ^ pl a ^ es were but 

 •0327 ^ tt ^ e tarnished. 

 •0037 

 •0319 



Pure Phosphoric Acid, solid. 





Grains of the glacial acid 



No. 



diluted to 20 ozs. 



1. 



.... 100 



2. 



.... 200 



3. 



.... 400 



4. 



.... 800 



5. 



.... 1600 



Value of 

 Deflection. 



•00005 

 •00005 

 •00040 

 •00060 

 •00370 



The hot plate was posi- 

 tive, and the plates were not 

 visibly tarnished. 



No. 



1. 



2. 

 3. 



Chloride of Copper (Basic ; solution filtered) . 



Grains of the salt Value of 



diluted to 12 ozs. Deflection. 



100 .... '0025 Hot copper positive. 



... 500 .... -0198) 



...1000 .... -0025 » negative. 



Much action on both plates, especially the hot one, and basic chloride 

 of copper formed. 



Chlorate of Copper. 

 In a moderately strong solution of this salt, which had been digested 

 with an excess of carbonate of copper and filtered, the hot plate was nega- 

 tive ; value of deflection "2997. Both plates were acted upon, but the hot 

 one the most. The liquid had a feebly acid reaction. 



Sulphate of Copper. 



No. 



1. 



9, 



Grains diluted 

 to 20 ozs. 



, . 249-5 

 , . 499-0 



Value of 

 Deflection. 



•0016 

 •0081 



Hot copper negative. 

 Liquid acid. 



