TTRINALYSIS. 1 43 



curdy precipitate is produced, it indicates an increased 

 quantity. (For clinical, see Tyson on Urine.) 



1. Make a standard solution of sodium phosphate 

 (10.885 grains of well crystallized sodium phosphate) 

 in distilled water and dilute to a liter. (50 c.c. then 

 contains .01 centigram of phosphoric acid. 



2. Make a saturated solution of potassium-ferrocy- 

 anide. 



3. Make a solution of sodium acetate by dissolving 

 10 grams of sodium acetate in 100 c.c .of acetic acid 

 c. p. and diluting the 1,00 c.c. with water. 



4. Make a solution of uranium acetate, such that I 

 c.c. will correspond to .005 milligrams of phosphoric 

 acid made as follows : Dissolve the uranium acetate in 

 water until the proper strength is obtained. 



Step i. Take 50 c.c. of standard solution of sodium 

 phosphate in a beaker with 5 c.c of the solution of so- 

 dium acetate. Heat to 90 degrees C. 



Step 2. Let the uranium solution run in until the 

 warm mixture ceases to precipitate. This is done from 

 a burette. 



Step 3. Take a small amount of the potassium so- 

 lution and place it on a clean white dish ; then transfer 

 a drop of the warm mixture to the dish containing the 

 potassium solution. If the reddish brown precipitate 



