Lead orthophosphates--II. Stability of cholopyromophite at 25°c

Details Lead orthophosphates--II. Stability of cholopyromophite at 25°c Lead orthophosphates--II. Stability of cholopyromophite at 25°c

Mar 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37..367n&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 3, pp.367-377

Mathematics

Logic

4

Scientific paper

The conversion of secondary lead orthophosphate [PbHPO 4 ] into chloropyromorphite [Pb 5 (PO 4 ) 3 Cl] in ca . 10 -1 M NaCl solutions has been investigated at 25°C. From the composition of the supernatant solutions, the solubility product constant for Pb 5 (PO 4 ) 3 Cl has been calculated to be 10 -84.4±0.1 , corresponding to G f ° of -906.2 kcal mol -1 . The solution equilibria and phase relationships in the system PbCl 2 -PbO-P 2 O 8 -H 2 O are discussed along with the geological implications.

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