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
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.
- 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)
- 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.
Volume of Acid Added = Starting Volume of Acid – Final Volume of Acid
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