374 ANALYTICAL CHEMISTRY. 



Reagents needed in qualitative analysis. 

 a. Liquids. 



1. Sulphuric acid, sp. gr. 1.84, H 2 SO 4 . 



2. Sulphuric acid diluted, sp gr 1.068 (1 part sulphuric acid, 9 parts water). 



3. Hydrochloric acid, sp. gr. 1.16, HC1. 



4- Hydrochloric acid diluted, sp. gr. 1.049 (6 parts hydrochloric acid, 13 parts 

 water). 



5. Nitric acid, sp. gr. 1.42, HNO 3 . 



6. Acetic acid, sp. gr. 1.048, C 2 H 4 O 2 . 



7. Hydrogen sulphide, either the gas or its solution in water, H 2 S. 



8. Ammonium sulphide, (NH 4 ) 2 S. 



9. Ammonium hydroxide (ammonia water), NH 4 OH. 



10. Ammonium carbonate, (NH 4 ) 2 CO 3 . A solution of one part of the commercial 



salt in a mixture of four parts of water and one part of ammonia water. 



11. Ammonium chloride, NH 4 C1 ; ten per cent solution. 



12 Ammonium oxalate, (NH 4 ) 2 C 2 O 4 ; five per cent, solution. 



13. Ammonium molybdate, (NH 4 ) 2 MoO 4 - A five per cent solution of the salt in a 



mixture of equal parts of water and nitric acid. 



14. Sodium hydroxide, NaOH. ~| 



15. Sodium carbonate, 



16. Sodium phosphate, NaHPO A . m i .- 



,_ c, ,. }- Ten per cent, solutions. 



17. Sodium acetate, NaC 2 H 3 O 2 . 



18 Potassium chromate, K 2 CrO 4 . 



19 Potassium dichromate, K 2 Cr 2 O r 

 20. Potassium iodide, KI 



21 Potassium ferrocyanide, K 4 Fe(CN) 8 . ,-,. 



oo T> * f -j T ^ /nxTx r Five per cent, solutions. 



22. Potassium ferricyanide, K 6 Fe 2 (CN) 12 . 



23 Potassium sulphocyanate, KCNS. 



24. Magnesium sulphate, MgSO 4 . ^ 



25. Barium chloride, BaCl 2 . L Ten per cent, solutions. 



26. Calcium chloride. CaCl 2 . ) 



27. Calcium hydroxide, CaiOH) 2 (lime-water). 1 



28 Calcium sulphate, CaSO, I Crated solutions. 



29 Ferric chloride, FeCl 3 . n 



30 Lead acetate, Pb.(C 2 H 3 2 ) 2 . 



31. Silver nitrate, AgNO 3 . [ Five per cent, solutions. 



32. Mercuric chloride, HgCl 2 . 



33. Platinic chloride, H 2 PtCl e . 



34. Stannous chldride, SnCl 2 .2H 2 O; ten per cent, solution. 



35. Solution of indigo 



36. Alcohol, C 2 H 5 OH. 



37. Sodium cobaltic nitrite solution, Co 2 (NO 2 ) 6 .6NaNO 2 + H 2 O. Four grammes of 



cobaltous nitrate, Co(NO 3 ) 2 .6H 2 O, and 10 grammes of sodium nitrite, NaNO.., 

 are dissolved in about 50 c.c. of water, 2 c.c. of acetic acid are added, and then 

 water to make 100 c.c. 



38. Alkaline mercuric-potassium iodide solution (Nessler's solution). Five grammes 



of potassium iodide are dissolved in hot water, and to this is added a hot 

 olution, made by dissolving 2.5 grammes of mercuric chloride in 10 c.c. of 

 water. To the turbid red mixture is added a solution made by dissolving 16 



