Work through the list without notes. If you cannot do a statement, follow its link, then come back. Guide = study guide; Practice = practice questions.
Understanding
- I can describe the four regions of a weak acid titration curve and name the major species in each. (Guide: “What a pH titration curve tells you”)
- I can explain why a strong and a weak acid with the same moles need the same volume of base. (Guide: “The equivalence point”; Practice Q6)
- I can explain why pH = pKa at the half-equivalence point, using the Ka expression. (Guide: “The half-equivalence point”)
- I can explain whether the equivalence-point pH is neutral, basic or acidic from the species left in the flask. (Guide: “What sets the pH”; Practice Q1, Q6)
Calculation
- I can find the concentration of a monoprotic analyte from the equivalence volume. (Practice Q3, Q5)
- I can read pKa from a curve or data table and convert it to Ka, or to Kb for a weak base. (Guide: Worked example 2; Practice Q2)
- I can calculate the pH at the start, in the buffer region, at equivalence and after equivalence for a monoprotic titration. (Guide: Worked example 1; Practice Q5)
- I can use the total volume of solution whenever I turn moles into a concentration after mixing. (Practice Q5, Q6)
Reasoning with curves
- I can find the number of acidic protons of a polyprotic acid from its titration curve. (Guide: Figure 2; Practice Q7)
- I can read pKa₁ and pKa₂ from a diprotic curve at the correct volumes. (Practice Q7)
- I can identify the major species at any point along a polyprotic curve. (Guide: Worked example 3; Practice Q4, Q7)
- I can find the moles of a polyprotic acid from its first equivalence volume. (Practice Q7)
- I can compare strong and weak acid curves: starting pH, buffer region and equivalence pH. (Guide: Figure 1; Practice Q6)
All ticked? Move on to Topic 8.6, Molecular Structure of Acids and Bases, or return to the course roadmap.