DETECTION OF THE BASIC ELEMENTS. 141 



h. Not. Filter the precipitate out, wash it with 

 hot water, dry a large portion of it, and mix it in- 

 timately with three or four times its bulk of a mix- 

 ture of equal parts of potassic and sodic carbon- 

 ate, and of potassic or sodic nitrate, and fuse the 

 mixture well on platinum foil. The fused mass is 

 bluish green. Manganese. 



If the substance contains little or no copper or 

 iron, this reaction for manganese may sometimes 

 be obtained with the original substance, when not 

 obtained here (§53). 16 



16. Boil the fused mass on the platinum foil with two 

 or three cubic centimetres of water, until it is loos- 

 ened from the foil, filter, add dilute nitric acid to 

 the filtrate, drop by drop, as long as any efferves- 

 cence is produced, and then add ammonia very 

 slowly and carefully, until, after stirring well, the 

 liquid has a faint alkaline reaction ; heat the mix- 

 ture a few minutes, and let it stand a long time in 

 a warm place, if no precipitate appears at first. A 

 white flocculent precipitate is formed, at once, or 

 after some time. Aluminium. - - - 17 



17. To another portion of the first solution add sodic 

 hydrate in excess, boil, and filter ; to the filtrate 

 add a few drops of ammonic carbonate, and then 

 ammonic chloride in excess, boil the mixture as 

 long as any odor of ammonia is given off, and a 

 portion of the filtered liquid gives no further pre- 

 cipitate on being boiled still more ; filter the 

 whole, and add potassic ferrocyanide to the filtrate. 



A white i^recipitate or a turbidity appears. Zinc. 18 



18. a. The substance contains no phosphoric acid, or 



only traces of it. - 19 



h. It does contain a notable quantity of this acid. 

 Add ferric chloride to another portion of F. 13, or 



