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What is total concentration of buffer used in derivation of buffer capacity?
ChemBuddy — The buffer capacity provides the following:
$$\ce{HA <=> H+ + A-}$$
Total concentration of the buffer $c_\mathrm{buf}$ is given by
$$c_\mathrm{buf} = [\ce{HA}] + [\ce{A-}]\tag{19.3}$...