412 



SALTS 



Chromatc, 6. Chromate of silver. This salt is easily ob- 

 tained by mixing together solutions of nitrate of 

 silver and chromate of potash. The chromate of 

 silver falls in the state of a dark red powder, 

 which is insoluble in water, or nearly so, and not 

 altered by exposure to heat. 43 grains of an- 

 hydrous nitrate of silver being dissolved in wa- 

 ter and mixed with a solution of 25 grains of 

 chromate of potash, the chromate of silver ob- 

 tained by precipitation, after being washed and 

 dried, weighed 39*67 grains. Carbonate of soda 

 being dropped into the residual liquid a slight ad< 

 ditional precipitate was obtained, which weighed 

 very nearly 2i grains ; so that the whole chro- 

 mate of silver obtained weighed 42*17 grains. 

 Now, if we suppose it to be a compound of 



Acetate, 



1 atom chromic acid 

 1 atom oxide of silver 



14-75 



21-25 



the whole of it would have amounted to 42\5 

 grains. This approaches so near the quantity 

 actually obtained, that there seems no room for 

 doubting that the correct constituents of the salt 

 are those just stated. * 



7- Acetate of silver. This salt may be ob- 

 tained by digesting oxide of silver in acetic acid. 

 The solution is colourless, but yields, by evapo- 

 ration, white crystals having a silky lustre, and 



