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From the solubility of precipitated Co(OH) 2 ( s ) determined radiometrically as a function of pH and ammonia content of the heterogeneous systems, the formation constants have been obtained for the following mononuclear hydroxo‐, ammine‐ and mixed hydroxo‐ammine‐complexes: Co(OH) 2 , Co(OH) 3 − , Co(NH 3 ) 2 2+ , Co(NH 3 ) 3 2+ , Co(NH 3 ) 4 2+ and Co(OH) 2 (NH 3 ) 2 . The solubility of cobalt(II) hydroxide has also been calculated. The medium was 1 M NaClO 4 and the temperature 25° C.
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Gübeli et al. (1970) studied this question.
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