182 UEINE. 



flame; a vivid yellow colour proves the 

 presence of sodium. 



5. Dissolve a portion in a little water, 

 add a drop or two of solution of platinic 

 chloride ; a yellow crystalline precipitate 

 indicates potassium. 



b. Boil the residue insoluble in water 

 with a little dilute hydrochloric acid, filter. 



1. Boil a portion with a drop of nitric 

 acid, add some potassium sulphocyanide 

 solution ; a deep red colour proves presence 

 of iron. 



2. Mix the rest with an excess of sodium 

 acetate, add an excess of ammonium oxa- 

 late ; a white precipitate proves the 

 presence of calcium. 



3. Filter off the lime precipitate, add to 

 the filtrate ammonia; a white crystalline 

 precipitate indicates the presence of 

 phosphate of magnesia. 



7. Add to 50 or 100 c. c. of the fresh urine 

 contained in a flask, a little milk of lime, 

 mix and cork loosely, suspending a mois- 

 tened red litmus paper between the cork 

 and the side of the flask. If the paper 

 turns blue the presence of ammonia is 

 proved. 



8. Distil some urine with sulphuric acid, add 

 to the distillate a little red fuming nitric 

 acid, and then shake up with a drop of 



