4.2 Acid-base titrations

• In an acid-base titration

  • a solution of a known concentration is reacted with a solution of unknown concentration
  • very specific apparatus is used to measure the volumes of solutions
  • an indicator is used to show the endpoint, when exact neutralisation has taken place
• Carrying out a titration

  • Use pipette to add 25cm3 of known solution to a conical flask
  • Place flask on white tile and add several drops of indicator
  • Add unknown solution to burette and record initial burette reading
  • Add unknown solution from burette to flask while swirling flask
  • Stop when colour change occurs
  • Measure final burette reading
  • Repeat entire procedure, adding dropwise when approaching the endpoint
  • Repeat until you obtain concordant titres