Section III · drill
Check the units before the arithmetic and read the axes before the curve. Each question names the move that carries to the next one.
A 25.0 mL sample of a monoprotic weak acid HA of unknown concentration is titrated with 0.100 mol L⁻¹ sodium hydroxide. The pH is recorded as base is added.
What is the pKa of HA?
Keys: 1–4 to answer, Enter for the next question.
On these items. All stimuli are written for this site, with values chosen so the arithmetic resolves cleanly. Real Section III questions are frequently harder to read than they are to solve — practise extracting the one relevant number from a paragraph that contains five.