CH. I.] 



STANDARD SOLUTIONS. 



27 



Series C. 50 cc. 0-2 M. acid potassium phosphate. 

 x cc. 0*2 N. sodium hydroxide. 

 Diluted to 200 cc. 



Brom-cresol purple. 

 Indicators recommended ] Brom- thymol blue. 



Phenol red. 



Series D. 50 cc. 0-2 M. boric acid in 0-2 M. potassium chloride. 

 x cc. 0-2 N. sodium hydroxide. 

 Diluted to 200 cc. 



(Cresol red. 



Indicators recommended 



(Thymol blue. 



