Acids & Bases — buffers, conjugates, titration curves
VCE Chemistry · Acid-base equilibria · 6 flashcards, free to study.
For the Unit 4 acid-base SAC. Focus on common 'why is pH > 7?' traps.
- Definition of pH
- pH = -log₁₀[H₃O⁺]
- What is a conjugate base?
- The species formed when an acid donates a proton.
- Strong acid example & dissociation
- HCl → H⁺ + Cl⁻ (full dissociation; Ka very large).
- Why is NH₄Cl(aq) acidic?
- NH₄⁺ donates H⁺ to water; conjugate acid of weak base NH₃.
- Buffer — definition & example
- Resists pH change on adding small amounts of acid/base. Example: CH₃COOH / CH₃COO⁻.
- At the equivalence point of a weak acid + strong base titration, pH is…
- > 7 — conjugate base of weak acid is left in solution.