How do you calculate the pH of a buffer solution?

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Answer 1 · 2015-04-24T09:04:13

You use the equation of Henderson-Hasselbalch.

A buffer is a solution of a weak acid and its conjugate base.

$HA    acid + H_{2} O ⇌ H_{3} O^{+} + A^{-}    base$ $underbrace ("HA")_text(acid) + "H"_2"O" ⇌ "H"_3"O"^+ + underbrace("A"^-)_text(base)$

The Henderson-Hasselbalch Equation gives you the pH of the buffer.

$pH = p K_{a} + log (\frac{[base]}{[acid]})$ $"pH" = "p"K_"a" + log("[base]"/"[acid]")$

This video explains in detail how to calculate the pH of a Buffer solution:
Acid - Base Equilibria | Buffer Solution.

Answer 2 · 2015-12-21T18:58:30

Watch this video.

This video explains in detail how to calculate the pH of a Buffer solution:
Acid - Base Equilibria | Buffer Solution.