84 SUBSTANCES SOLUBLE IN WATER. 



apparatus recommended by Schulze 1 (Fig. 3), a weighed quantity 

 of powdered aluminium added, and solution of caustic soda slowly 

 from the deficit in the amount of hydrogen yielded the 



run in 



Fig. 3. 



nitric acid present may be calculated. The following are the 

 details of the operation : 



A measured quantity of solution of caustic soda is introduced 

 into the pear-shaped flask B. The end of the glass-rod c is 

 accurately ground into the delivery-tube of B, so that no soda 

 can escape into A until the rod c is raised. The tube C is 



1 Zeitschr. f. anal. Chem. ii. 379, and vi, 379. 





