【abc】評論
緩衝溶液適用Henderson–Hasselbalch equationpH = pKₐ + log([A⁻]/[HA])此處pKₐ=4.74pH=4.74+log (0.05/0.5) =4.74+log(0.1) =4.74-1 =3.74Henderson–Hasselbalch equation怎麼來的可參考https://chem.libretexts.org/Ancillary_Materials/Reference/Organic_Chemistry_Glossary/Henderson-Hasselbach_Equation(基本上就是把Ka的式子移項再取-log就可以了~)