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MEASUREMENT OF THE APPARENT DISSOCIATION CONSTANTS OF CARBONIC ACID IN SEAWATER AT ATMOSPHERIC PRESSURE1

Limnology and Oceanography · 1973 · Vol. 18(6) · pp. 897–907

C. Mehrbach✉(Oregon State University)Chris Culberson(Oregon State University)J. E. Hawley(Oregon State University)Ricardo M. Pytkowicx(Oregon State University)

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Abstract

The apparent dissociation constants of carbonic acid in seawater were determined as functions of temperature (2–35°C) and salinity (19–43 ‰ ) at atmospheric pressure by measurement of K’x and the product K'� K'2. At 35%° salinity and 25°C the measured values were p K ′ 1 = 6.000 and p K ′ 2 = 9.115; at 35 ‰ and 2°C the measured values were p K ′ 1 = 6.177 and p K ′ 2 = 9.431.

Water Quality Monitoring and AnalysisSeawaterCarbonic acidEnvironmental chemistryDissociation (chemistry)ChemistryDissociation constantEnvironmental scienceOceanographyAtmospheric sciencesGeology

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