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Unformatted text preview: = [H+] [ OH] water is 55.5 M, Keq x 55.5 M = 1 x 10 –14 (at 25 oC) = ion product of water (a constant). Since [H+] = [ OH], then [H+] = 1 x 10 –7 M Definition of pH A convenient way to express [H+] is by pH: pH = log 1/[H+] pOH = log 1/[ OH] pH + pOH = 14 HendersonHasselbalch Equation Relates pH to concentrations of conjugate acids and bases. Conjugate acid <  > conjugate base + H+ [H+] [conjugate base] Keq = [conjugate acid] 1 1 [conjugate base] =  • [H+] [Keq] [conjugate acid] 1 1 [conjugate base] log  = log  + log [H+] [Keq] [conjugate acid] [conjugate base] pH = pK + log [conjugate acid]...
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 '09
 STOVER,P.
 pH, conjugate base, Keq

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