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HYDROLYSIS AND POLYMERIZATION OF Hf IONS IN HYDROCHLORIC ACID

V.M. Peshkova, P.G.P. Ang

Abstract

Hydrolysis consiants for Hf ions were determined to be: K/sub 1/ = 1.33 plus or minus 0.02, K/sub 2/ = 0.59 plus or minus 0.01, K/sub 3/ = 0.38 plus or minus 0.02, and K/sub 4/ = 0.30 plus or minus 0.03. Hafnium ion concentrations forming polymers in 1 molar HClO/sub 4/ were SIGMA (Hf) = 1.0 x 10/sup -3/ mole; in 2 molar HClO/sub 4/, SIGMA (Hf) = 2.0 x 10/sup -3/ mole. A monomer, trimer, and tetramer are formed in 1 and 2 molar HClO/sub 4/. The equilibrium constants were calculated for STAHf/sub 3/(OH)/sub 4/!/sup 8-/ and .34 x 10/sup 4/ and K/sub 4.8/ = 1.01 x 10/sup 8/) and in 2 molar HClO/sub 4/ (K/ sub 3.4/ = 4.20 x 10/sub 4/ and K/sub 4.8/ = 4.32 x 10/sup 8/). (R.V.J.)

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Key concepts: Trimer, Chemistry, Tetramer, Monomer, Hydrochloric acid, Ion, Hydrofluoric acid, Analytical Chemistry (journal)