ISSN:
1572-8927
Keywords:
Sodium phosphate
;
phosphoric acid
;
dissociation constants
;
marine systems
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The first and second acidity constants of phosphoric acid were determined in a 0.70 ionic strength solution of both a sodium and a potassium ion background salt at 25°C. These experimentally determined constants were compared to literature values as well as values calculated from a theoretical model. Assuming negligible ion pairing of the phosphate ligand with the potassium ions, the stability constants of the NaHPO 4 - and NaH2PO 4 0 complexes were determined to be 1.3±0.3 and 0.49±0.07 (mol-L−1), respectively. These constants were used to model the speciation of orthophosphate in a background of a sodium salt from pH 3 to 10.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00649742
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