L a b o r a t o i r e d e D ynam ique e t T h e rm o p h y s iq u e des f l u i d e s U n i v e r s i t e de P r o v e n c e C e n t r e de S t Jerd m e Rue H e n r i P o in c a r d 13397 M AR SEILLE CEDEX 13 FRANCE ABSTRACT. In o r d e r t o o b t a i n th e rm o d y n a m ic i n f o r m a t io n on m ix t u r e s c o n s t i t u t e d w i t h a l k a l i m e t a ls and t h e i r h a l i d e s , we i n v e s t i g a t e d t h e K-KC1 s y ste m by v a p o r p r e s s u r e m e a s u re m e n ts

more »

... . The m ethod c h o s e n u s e s t h e f e a t u r e s o f b o th t h e R o d e b u sh -D ix o n and e b u l l i t i o n m e th o d s . T he a p p a r a t u s , c o n s i s t e n t w it h t h e e x p e r im e n t a l r e q u ir e m e n t s o f s u ch a s y s te m , a llo w s one t o i n v e s t i g a t e a w id e t e m p e r a t u r e and p r e s s u r e r a n g e . The d e t e r m i n a t i o n o f t h e v a p o r p r e s s u r e o f p o ta s s iu m b etw ee n 970 and 1140 K was a c h e c k on t h e o p e r a t i o n o f t h e a p p a r a t u s . V a p o r p r e s s u r e m e asu re m e n ts a b o ve t h e K-KC1 l i q u i d b a th b etw ee n 970 K and 1140 K y i e l d e d t h e a c t i v i t y o f p o ta s s iu m a t XK = 0 . 1 , 0 . 2 , 0 . 3 , 0 .4 , 0 . 5 , 0 . 6 , 0 . 7 , 0 . 8 and 0 . 9 .