1. Why is the phosphate buffer made up by using the
Henderson-Hasselbalch equation not the expected pH?
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The Henderson-Hasselbach equation provides a general solution to
the quantitative treatment of acid-base equilibria in biological
systems (Garrett & Grisham, 2005, Biochemistrym, p.42).
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Its an equation you can use to find the pH of a solution.
it is.... --- pH = pKa + log (Base/Acid) ---
these may help too
Ka = 10^-pKa
Kw = Ka*Kb
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the pH of ethanol can be calculated using its pKa value (pKa
15.9) and the Henderson-Hasselbalch equation.
pH = pKa - log [AH/A]
where [AH/A] the ratio of disassociated versus undisassociated
species in solution.