Titration

• Titrations are used to find concentrations. Titrations find out how much acid is needed to neutralise an alkaline (vice versa)
• At the end of the practical what do you always do?

  Repeat and Calculate mean
• To make a Titration Pratical Accurate, Swirl more or repeat the practical and calculate the mean.
• TITRATION PRACTICAL:

  1. Use a pipette to transfer 25cm of sodium hydroxide in conical flask.
  2. Add drops of indicator to the flask.
  3. Place flask on white tile to see colour change clearly.
  4. Fill Burette with sufuric acid.
  5. Add acid (DROP BY DROP) to alkaline till solution neutral.
  6. Swirl.
  7. Read volume on burette at EYE LEVEl.
  8. Repeat and Calulate mean.

  
• 3 Types of Indicators

  • Litmus Paper = red - acid | blue - akaline
  • Phenolphthalein = colourless- acid | pink -alkaline
  • Methyl orange = red - acid | yellow - alkaline.
• In Titration you swirl to To evenly distribute the added acid/alkali