THORIUM NITRATE TITRATION METHOD FOR THE ESTIMATION OF FLUORINE - PART I

Abstract

1. The  thorium  nitrate  titration  method  for  fluorine  estimation  has  been  investigated.
2. It  is  shown  that  the  reaction  between  fluorine  as  NaF  and  thorium  nitrate  is  different  from  that  taking  place  between  fluorine  as  hydrofluosilicic  acid  and  thorium  nitrate.  In  the  first  case,  ThP.  is  formed,  and  in  the  second,  H2ThF6
3. It  is  further  shown  that  the  reaction  between  thorium  salt  and  hydrofluosilicic  acid  is  not  always  the  same  and  is  determined  by  the  manner  in  which  hydrofluosilicic  acid  is  distilled.  Conditions  have  been  indicated,  which  give  rise  to  variations  in  the  reaction  between  thorium  salt  and  hydrofluosilicic  acid.