Stabilisation of tetravalent cerium in perchloric acid medium and measurement of the stability constants of its fluoride complexes using ion selective potentiometry

✍ Scribed by R.M. Sawant; R.K. Rastogi; M.A. Mahajan; N.K. Chaudhuri

• Book ID: 116069784
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 479 KB
• Volume: 43
• Category: Article
• ISSN: 0039-9140
• DOI: 10.1016/0039-9140(95)01719-4

✦ Synopsis

The stability constants of the fluoride complexes of cerium (IV) in 1 M (HCIO,, NaClO,) medium have been measured potentiometrically using a fluoride ion-selective electrode. Quantitative oxidation of cerium to its tetravalent state and its stabilisation in the perchlorate medium were accomplished by oxidation with AgO followed by quick addition of a known amount of fluoride ion. This procedure ensures stability of the oxidation state and prevents hydrolysis and polymerisation of Ce(IV). Logarithms of the average values of /?, , a,. p and p4 were estimated to be 7.57 i 0.04, 14.50 ) 0.03, 20.13 f 0.37 and 24.14 5 0.10 respectively.