Practice question

pH = pKa + log ([A⁻]/[HA]) correctly identifies the graphical representation, mathematical relationship, or plot parameter described in this question. In pH and Buffer, graphical analysis transforms complex kinetic or biological data into linear relationships that allow precise determination of key parameters. The specific feature described by pH = pKa + log ([A⁻]/[HA]) is derived from the mathematical transformation of the underlying equation and has a defined physical meaning. The other options (pH = log [H⁺], pH = -log [OH⁻], and pH = Kw / [H⁺]) represent different parameters, intercepts, or slopes from either the same or different analytical methods.