SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 35:881-883 (1971)
© 1971 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Calcium Complexing and the Enhanced Solubility of Gypsum in Concentrated Sodium-Salt Solutions1

F. S. Nakayama2

ABSTRACT

Solubility of Gypsum in NaClO4, NaCl, NaNO3, and NaOAc solutions and their mixtures was determined experimentally and theoretically. The dissociation constants of CaCl+, CaNO3+, CaOAc+, NaOAc0, and NaNO30 were computed from the solubility behavior of the solid. The predicted solubility values corresponded closely to the measured values in mixed Na-salt solutions when allowances were made for Ca-complexing.

NOTES

1 Contribution of the Soil & Water Conservation Research Division, ARS, USDA, Phoenix, Ariz.

2 Research Chemist, US Water Conservation Lab., 4331 East Broadway, Phoenix, Ariz. 85040.

Received for publication March 9, 1971. Accepted for publication June 14, 1971.






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