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By J A A Ketelarr

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Extra info for Chemical constitution;: An introduction to the theory of the chemical bond

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13. , Prigogine I . , Bellemans Α . , "Sur­ face Tension and Adsorption," Longmans Green, London, 1966. 14. , and Warner T . B . , Potential of a platinum electrode at low partial pressures of hydrogen and oxygen. II. An improved gas-tight system with a negligible oxygen leak. J . Electrochim. Soc. 113, 573-577 (1966). 15. Teder Α . , The equilibrium between elementary sulfur and aqueous polysulfide solutions. Acta Chem. Scandinavia 25, 1722-1728 2 2 2 (1971 ). , Optical spectra and equilibrium distribution of polysulfide ions in aqueous solutions at 2 0 ° .

2 Pt-HS" + H 0 3 Thus t h e e q u i v a l e n t p r o c e s s electrode i s H Q + + e" 3 2 2 2 c o n t r o l l i n g the potential of thePt + Η + HG 2 where Η i s h y d r o g e n a d s o r b e d on t h e p l a t i n u m s u r f a c e , and t h e redox p o t e n t i a l i s Eh = - 0 . 0 5 9 ( p K H + pH + l o g ( H ) ) + w i t h K|_j = ( H ) / ( e ~ ) " ( H 0 ) , and (H) i s t h e a c t i v i t y o f Η atoms on t h e p l a t i n u m . The s u r f a c e a c t i v i t y o f Η atoms c a n be assumed t o f o l l o w t h e law 3 CH) = k - ( H S ) 1 / n 2 as f o u n d i n s o l i d - s o l u t e i n t e r a c t i o n s ( 1 3 ) .

V = 10 . 36 X 10' mol/kg. Evolution of the molality of characteristic species as a function of ξ. Other definitions are similar to Figure 14. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1979. 2. BOULEGUE A N D MICHARD FeS + S 2 Sulfur Speciations and Redox Processes * FeS 2 + 47 (8) S ^ . E l e m e n t a l s u l f u r , i n t h e f o r m o f h i g h l y r e a c t i v e c o l l o i d C20], c a n be t h e n u c l e u s o f a d d i t i o n a l p y r i t e r e f o r m a t i o n f o l l o w i n g p o l y s u l ­ f i d e f o r m a t i o n on t h e s u r f a c e o f t h e c o l l o i d a l p a r t i c l e s and r e a c t i o n w i t h F e ^ a s shown by K r i b e k ( 2 9 ) .

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