Specification Point 2.33C (Paper 2C Only):
Describe how to carry out an Acid – Alkali Titration

Acid – Alkali Titration

Titration: A method to determine the exact volume of one solution that will react with a given volume of another solution

Titration, Edexcel IGCSE Chemistry

The setup of a Titration

Titration is a quantitative experimental technique used in neutralisation reactions between acids and alkalis. It involves adding an acid from a burette into a conical flask containing the alkali. A pipette is used to measure out the exact volume of alkali and an indicator is added so the end point of the titration can be seen.

Method:

  • Use pipette to measure alkali solution into conical flask
  • Add drops of indicator (Phenolphthalein or Methyl Orange)
  • Add acid into burette and note the starting volume
  • Add acid in burette into alkali in flask continuously swirling until indicator changes to colour indicating the solution is neutral.
  • Note the final volume of acid in burette
  • Repeat until you have three concordant results (within 0.1 of each other)

Indicators

  • Universal indicator is not used as there is no end-point, it is difficult to see when the colour changes.
  • Phenolphthalein or Methyl Orange is used as there is an end-point so is easy to see the colour change.

Calculation

Volume of Acid Added   =   Starting Volume of Acid   –   Final Volume of Acid

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Author: Jamie

Jamie got a First class degree in Chemistry from Oxford University before going on to teach chemistry full time as a professional tutor. He’s put together these handy revision notes to match the Edexcel IGCSE Chemistry specification so you can learn exactly what you need to know for your exams.