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Thermodynamic Stability of Zirconium(IV) Complexes with Hydroxy Ions
Author(s) -
Veyland Anne,
Dupont Laurent,
Pierrard JeanClaude,
Rimbault Jean,
Aplincourt Michel
Publication year - 1998
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199811)1998:11<1765::aid-ejic1765>3.0.co;2-#
Subject(s) - chemistry , zirconium , ion , chemical stability , inorganic chemistry , stability (learning theory) , organic chemistry , machine learning , computer science
A protometric study on the speciation of zirconium(IV) was performed in an aqueous solution at 25 °C in KNO 3 and four ionic strengths (0.2, 0.5, 1, and 2 mol·dm −3 ). This study indicates the formation of the soluble species Zr(OH) 3 + , Zr 2 (OH) 7 + , and Zr(OH) 4 in the pH range 1.5–3.5. The use of an appropriate titration technique allows the precipitation of the zirconium hydroxide to be limited. The overall stability constants β mlh of these three hydroxo complexes were computed and refined, by the program PROTAF, for each ionic strength. The solubility product K s of Zr(OH) 4 was calculated by taking these β mlh constants into account. The thermodynamic values were determined by extrapolation at zero ionic strength (Specific ion Interaction Theory method): log β° 10–3 = –0.52 (0.01); logβ° 20–7 = –2.22(0.07); logβ° 10–4 = –4.52 (0.07); log K s° = –55.26(0.08).