Flashcards in this deck (17)

• What does the conductivity of a solution depend on?

  • Concentration of ions
  • Mobility of ions
  • H+ ions are more conductive than OH- ions
  chemistry conductivity
• What is the general rule for conductivity in titrations?

  • Strong → Linear
  • Weak → Curved
  chemistry titration
• What happens to conductivity when a strong acid is titrated with a strong base?

  Conductivity increases rapidly at equivalence point.
  chemistry titration
• What occurs during a weak acid + strong base titration initially?

  Conductivity is initially low due to partial ionisation of the weak acid.
  chemistry titration
• What effect does the addition of a strong base have during a weak acid + strong base titration?

  • H+ is replaced by Na+ (less conductive)
  • CH3COO- ions suppress ionisation of CH3COOH
  chemistry titration
• What happens to conductivity after the equivalence point in a weak acid + strong base titration?

  Conductivity increases rapidly as Na+ and OH- are added.
  chemistry titration
• What is the reaction equation for strong acid + weak base titration?

  HCl(aq) + NH3(aq) → NH4Cl(aq)
  chemistry titration
• What occurs to conductivity before the equivalence point in a strong acid + weak base titration?

  Conductivity decreases as H+ is replaced by NH4+.
  chemistry titration
• What happens to conductivity after the equivalence point in a strong acid + weak base titration?

  Graph becomes almost horizontal as excess weak base is not significantly ionised.
  chemistry titration
• What is the behavior of conductivity in a weak acid + weak base titration?

  • CH3COOH partially ionises
  • H+ gets used up, producing CH3COO-
  chemistry titration
• What is the weak acid used in the titration example?

  Acetic acid (CH₃COOH)
  chemistry acids
• What is the strong base used in the titration example?

  Sodium hydroxide (NaOH)
  chemistry bases
• What does the conductivity curve indicate in titrations?

  Changes in ion concentration during titration.
  chemistry titration
• What is the equivalence point in a titration?

  Point where moles of acid equal moles of base.
  chemistry titration
• Which weak base is mentioned in the conductivity curve example?

  Ammonia (NH₃)
  chemistry bases
• What is the significance of the conductivity curve in titration?

  It shows the change in conductivity as titration progresses.
  chemistry titration
• What does a conductivity curve for a weak acid and weak base look like?

  It shows gradual changes without a sharp rise at equivalence point.
  chemistry titration