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C. (See Discussion.) Solid curves based on ion size parameter 4.3 A. for carbonate and phosphate systems dashed curves based on 6.0 A. Diameter of circles equals 0.008 in pK¡.Konopik and Leberl,18 who reported a value between 11.70 and 11.95 from colorimetric data but with very insecure treatment of activity coefficients. Both references17•18 summarize older data for historical interest.Acknowledgments.-We wish to express our appreciation to the sources listed in Ref. 2 for fellowships supporting the junior author (A.

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