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Some Aspects of Zinc and Copper Phosphate Formation in Aqueous Systems
Author(s) -
Jurinak J. J.,
Inouye T. S.
Publication year - 1962
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1962.03615995002600020015x
Subject(s) - zinc , copper , chemistry , phosphate , aqueous solution , inorganic chemistry , dissociation (chemistry) , zinc phosphate , isoelectric point , nuclear chemistry , biochemistry , organic chemistry , enzyme
Zinc and copper systems were titrated with NaOH in the presence of varying amounts of KH 2 PO 4 . The data indicated zinc formed the orthophosphate, Zn 3 (PO 4 ) 2 · 4H 2 O while copper precipitated as the basic phosphate, Cu 5 (H 2 PO 4 ) 2 (OH) 8 . The pK sp calculated from the dissociation of these phosphates at their respective isoelectric pH values were 47.9 and 92.5 for zinc and copper phosphate, respectively. Basic copper phosphate was less soluble than zinc orthophosphate at all pH levels studied.