144 LABORATORY METHODS OF 



does not appear, continue the adding of the uranium 

 solution until it does. Then read off the amount used. 

 This is the amount that will precipitate o.i decigram 

 of phosphoric acid. Now make a quantity of the 

 uranium solution, say a liter. 



SULPHATES. 



Make a solution so that i c.c. of the solution of bari- 

 um chloride will precipitate 12.50 milligrams of sul- 

 phuric acid prepared as follows : 



1. Solution.. Dissolve 30.50 grams of barium chlo- 

 ride in a liter of water. 



2. Solution the same strength as the one above, but 

 a different solution. Dissolve 27.57 grams of potas- 

 sium sulphate in a liter of water. 



CHLORIDES. 



1. Make a saturated solution of potassium chro- 

 mate. 



2. Make a solution of silver nitrate such as I 

 c.c. will precipitate 10 milligrams of NaCl, as fol- 

 lows : Dissolve 29 grams of stick silver nitrate in a 

 liter of water. 



ABNORMAL URINE. 



Sugar solution. 30 grains of copper sulphate dis- 

 solved in one-half ounce of water; then add one-half 



