PRACTICE XIV 



DETERMINATION OF NITROGEN IN AMMONIUM SULFATE 



Place 10 cc. of the ammonium sulfate solution in a Kjeldahl flask, 

 connect in the distillation apparatus, add 10 cc. of the alkali solu- 

 tion, and distill into a 300-cc. Erlenmeyer flask containing 10 cc. of 

 the standard hydrochloric acid and about 15 cc. of ammonia-free 

 water to a volume of 200 cc. Add lacmoid arid titrate the excess 

 acid with standard ammonia. 



Titrations (1) cc. NH 3 



(2) cc.NH, 



Av cc. NH 3 



N in 10 cc. of solution nig. 



Per cent N in dry salt 



The percentage purity of the dry salt is 



Does the percentage of nitrogen vary directly or inversely with 

 the titration readings ? 



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