352 



On Chemical Tests. 



TABLE OF RE-AGENTS. 



1 Ammonia. 



2 carbonate. 



3 hydrosulphuret. 



4 Copper, metallic. 



5 Galls, tincture. 



6 Iron, metallic. 



7 protosulphate; 



8 Mercury cyanuret. 



9 ,, protonrtrate. 



10 Muriatic acid. 



11 Muriates. 



12 Oxalic acid. 



13 Oxalates. 



14 Potash. 



15 „ carbonate. 



Nickel— 2, 14, 15, 17 apple-green precipitates. 12 no immediate pre- 

 cipitate, but after some time a greenish precipitate. 20 

 white precipitate tending to green. 3 black precipitate. 25 

 after a time solution blackens. 



Osmium— 5 purple changing to deep blue. 3 yellow. Solution of 

 lime and of carbonate of soda produce a yellow colour :— 

 solutions of lead, yellowish brown. 



Palladium — 7 precipitates metallic palladium. 8 bright yellow preci- 

 pitate, but not immediately; 20 olive. 25 dark brown. 26 

 brown precipitate in nitric solution. 



Platinum — 1, 2, 14, 15, 17 cause yellow precipitates. 7, 8, 12, 22 pro- 

 duce no precipitate. 26 deep reddish brown colour. 19 the 

 same with a precipitate. 3, 25 brownish black precipitate, but 

 25 not immediately. 27 metallic platinum in black powder 

 20 changes solution from yellow to green. 



Rhodium — 1, 14 yellow. Muriate of platina gives a yellow precipitate. 

 Alcohol and water a rose red colour. 3, 25 brown precipitate. 



Silver— 1, 14 brown precipitate. 2, 7, 10, 11, 12, 15, 17, 20, 26 pro- 

 duce white precipitates. 22 yellow. 19 white inclining' to 

 yellow. 21 reddish brown. 3, 25 black precipitates. 4,6,27 

 precipitate oxide of silver. 



Tellurium — is soluble in the nitric, nitro-muriatic and sulphuric acids. 



The nitric solution is permanent when diluted : but the nitro- 

 muriatic lets fall a submuriate on the addition of distilled 

 water. The sulphuric solution is of a deep blue or purple 

 colour. Heat precipitates the metal white ; but if diluted with 

 water, black. 5 produces a flaky yellow precipitate. 



Tin— protoxide. 1, 2, 12, 14, 15, 17, 21, 22 cause white precipitates ; 



20 white gelatinous precipitate. 19 white flocculent precipi- 

 tate inclining to yellow or red. 3, 25 yield dark brown preci- 

 pitates. 27 metallic tin in the form of small greyish white 

 spangles. • 



