pKa. pKa1 = 10.7; pKa2 = 7.6. HSDB 2005. Vapor pressure. 10.7 mm Hg at 20°C. 10 mm Hg at 21.5°C. 12.1 mm Hg at 25°C. Parmeggiani 1983. Benya and Harbison 1994.
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