INTRODUCTORY REMARKS. 225 



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 S . 



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 (water of ammonia), 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 water of ammonia. 



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, Na 2 CO 3 



16. Sodium phosphate, Na 2 HPO 4 . 



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



18. Potassium chromate, K 2 CrO 4 . 



19. Potassium dichromate, K 2 Cr 2 O 7 . 



20. Potassium iodide, KL 



21 Potassium ferrocyanide, K 4 Fe(CN) 6 . 



Ten per cent, solutionst 



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 . [ Ten per cent, solutions. 



26. Calcium chloride, CaCl 2 . 



27. Calcium hydroxide, Ca( OH) 2 (lime-water). | Saturated solutions. 



28. Calcium sulphate, CaSO 4 . 



29. Ferric chloride, Fe 2 Cl 6 . "1 



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



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



32. Mercuric chloride, HgCl 2 - 



33. Platinic chloride, PtCl 4 . J 



34. Stannous chloride, 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 2 , 

 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 

 solution, made by dissolving 25 grammes of mercuric chloride in 10 c.c. of 

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



15 



