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Acids and bases

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A \(\log C-p H\) diagram for an acid/base system containing \(10^{-2.7} M\) TOTA is shown below. The fully protonated form of the acid is \(\mathrm{H}_{4} \mathrm{~A}\). The \(s\) values indicate the slope of the curve in the given region, and the \(\mathrm{pH}\) values indicate the intersection points of the various curves. What is the equilibrium constant for the reaction \(\mathrm{H}_{3} \mathrm{~A}^{-} \leftrightarrow \mathrm{HA}^{3-}+2 \mathrm{H}^{+} ?\) What is the value of \(K_{b}\) for a reaction in which \(\mathrm{HA}^{3-}\) is the acid?

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