The Determination of the Stability Constants of Mononuclear and Polynuclear Species of Mono‐ and Dicarboxylic Acids via Potentiometric Titrations

Prom emf measurements i n t i t r a t i o n s a t c o n s t a n t l i g a n d c o n c e n t r a t i o n (cL) t h e formation function n is c a l c u l a t e d f o r aqueous s o l u t i o n s of a-hydroxyisob u t y r i c a c i d of 1-1 a t 2J.C. From CL -0.2 I4 on these f u n c t i o n s grow s e p a r a t e , keeping only one cross-over p o i n t i n cormmn. of a s s o c i a t e d forms a reasonably good agreement w a s obtained with t h e experiment. However, a f t e r c o r r e c t i o n of t h e emf d a t a f o r a l l e f f e c t s l e a d i n g t o a changed a c t i v i t y c o e f f i c i e n t o f t h e measuring e l e c t r o l y t e and for the consequent changes i n the formal d i s s o c i a t i o n c o n s t a n t , the d a t a again can best be described by a normal monoprotic d i s s o c i a t i o n behaviour.Considering then the presence

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Potentiometric Investigation of the Complexes Formed by Citraconate in Water at Ionic Strength I=1 and I=3

Bouserie

Thun

1987

Bulletin des Soc Chimique

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a c i d i n aqueous sodium p o r c h l o r a t e s o l u t i o n s of i o n i c s t r e n g t h 1 and 3.A potontiometric study is made a t 25'C of t h e d i s s o c i a t i o n of c i t r a c o n i c IWTRODUCTION I n foregoing pap.rsLfZ1' on t h e p o t e n t i m e t r i c study of t h e d i s s o c i at i o n of mono-and d i p r o t i c a c i d s s p e c i a l a t t e n t i o n was paid t o an a n a l y s i s of t h e emf e f f e c t s caused by s e l f -a s s o c i a t i o n of t h e a c i d and by compositional c h~n g e s during experiment. tormine experimentally ~1 1 c o n t r i b u t i o n s of compositional changes t o t h e emf s h i f t . A f t e r c o r r e c t i o n f o r t h e s e e f f e c t s t h e E-[Ll curve# no longer showed signs of s e l f -a s s o c i a t i o n . acids, (H2L),on condition t h e two d i s s o c i a t i o n s t e p s are s u f f i c i e n t l y separated to study t h e i n d i v i d u a l influence of HL-and Lon t h e mean a c t i v i t y c o e f f ic i e n t o f t h e measuring e l e c t r o l y t e . However, as A g e n e r a l technique, it is b e t t e r only t o analyse t h e emf s h i f t when t h e presence of s e l f -a s s o c i a t i o n is c e r t a i n . Therefore, i n this paper, t h e experimental i n v e s t i g a t i o n of an a c i d w i t h w e l l spread d i s s o c i a t i o n s t a g e s is described. C i t r a c o n i c a c i d (Kc1/Kc2 > ) was s t u d i e d a t two i o n i c s t r e n g t h s i n o r d e r t o f a c i l i t a t e t h e d i s t i n c t i o n botween s e l f -a s s o c i a t i o n of t h e a c i d and v a r i a t i o n of t h e a c t i v i t y c o e f f i c i e n t s .For indoed a higher I w i l l reduce t h e i n f l u e n c e of compositional changes on t h e .mf-signal.The lower d i e l e c t r i c u m of such s o l u t i o n s however promotes assoc i a t i o n of i o n i c substances. EXPERIMENTAL T i t r a t i o n technique and apparatusFormation curves w e r e determined by t i t r a t i n g c i t r a c o n i c a c i d s o l u t i o n s with di-#a-citraconato s o l u t i o n s and v i c e versa; d i l u t i o n curves by t i t r a t i n g buffor solution. with sodium p o r c h l o r a t e s o l u t i o n s and v i c e versa. A l l t i t r at i o n s were performed i n a cell without t r a n s p o r t while n i t r o g e n was bubbling through the s o l u t i o n .

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The Determination of the Stability Constants of Mononuclear and Polynuclear Species of Mono‐ and Dicarboxylic Acids via Potentiometric Titrations

Cited by 4 publications

References 22 publications

The Dissociation of Monoprotic Acids. Influence of Composition Changes in the Solution on the Potentiometric Determination at Constant Ionic Strength

The Dissociation of Monoprotic Acids. Influence of Composition Changes in the Solution on the Potentiometric Determination at Constant Ionic Strength

Potentiometric Investigation of the Dissociation of α‐Hydroxyisobutyric Acid in Aqueous Sodiumperchlorate Solutions of Unit Ionic Strength at 25°C

Potentiometric Investigation of the Complexes Formed by Citraconate in Water at Ionic Strength I=1 and I=3

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