SECTION THREE 



METHYL ORANGE 



pH 2 •9-4- 1 



Methyl orange .. .. .. .. o-i gm. 



Distilled water . . . . . . . . 80 ml. 



Absolute alcohol . . . . . . . . 20 ml. 



METHYL RED 



pH 4-2-6-2 



Methyl red . . . . . . . . . . 0-04 gm. 



Alcohol 50% . . . . . . . , 100 ml. 



METHYL VIOLET 



pH 0-1-3 -2 



Methyl violet indicator . . . . . . 0-25 gm. 



Distilled water . . . . . . . . 80 ml. 



Absolute alcohol . . . . . . . . 20 ml. 



a-NAPHTHOLBENZEIN 



(p-naphtholbenzein) pH 8 •5-9-8 



a-Naphtholbenzein . . . . . , i gm. 



Alcohol 70% . . . . . . . . 100 ml. 



a-NAPHTHOLPHTHALEIN 



pH 7-3-8-7 



a-Naphtholphthalein .. .. .. o-i gm. 



Alcohol 50% . . . . . . . . 100 ml. 



NEUTRAL RED 



pH 6-8-8-0 



Neutral red . . . . . . . . . . o-i gm. 



Distilled water . . . . . . . . 80 ml. 



Absolute alcohol . . . . . . . . 20 ml. 



p-NITROPHENOL 



pH 5-0-7-0 



p-Nitrophenol . . . . . . . . 0-25 gm. 



Distilled water . . . . . . . . 80 ml. 



Absolute alcohol . . . . . . . . 20 ml. 



543 



