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What is the pKa of water? - Chemistry LibreTexts

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It is incorrect to present the value of 15.7 for the pKa of water, yet this value has entered the fields of organic chemistry and biochemistry. The proposed value of 1.8 x 10-16 for the Ka of water …

Last updated Save as PDF Page ID35871 In most general chemistry textbooks, the pKa of water at 25 ºC is listed as 14.0. In many organic chemistry textbooks and some biochemistry texts, however, the pKa of water at 25ºC is listed as 15.7. This module describes the derivation of these two values and describes why the value of 15.7 should not be used. Much of the information in this module comes from three papers with more comprehensive coverage of the topic.1,2,18 Two Values for the Same Equilibrium Constant? The value of 14.0 for the pKw of water at 25ºC has been experimentally…

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