Method

  • Use a pipette to transfer 25cm of alkali solution into a conical flask
  • Add 5 drops of methyl orange to the conical flask
  • Place conical flask on white tile
  • Fill a Burette with Acid
  • Add acid to alkali slowly and once you see a colour add drop by drop until the solution is neutral making sure to swirl solution to mix. Methyl orange colour change will be yellow to red
  • Read volume of acid from burette making sure your eye is level and read from the bottom of the meniscus
  • Repeat until 2 readings are within 0.1cm and take a mean
  • Now calculate concentration of acid