The dissociation constant of a weak acid HX is, . The buffer HX + NaX can be best used to maintain t — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

An acidic buffer is most effective in a pH range of $pK_a \pm 1$. Given $K_a = 10^{-5}$, the $pK_a = -\log(10^{-5}) = 5$. Thus, the effective buffering range is $5 \pm 1$, which is 4 to 6.