Titrations

Titrations are used to find out the concentration of an acid or an alkali solutions using a suitable indicator. The method for a titration is described below:

• Using a pipette, add a measured volume of alkali into a clean conical flask.
• Add a few drops of indicator. The most commonly used indicators are phenolpthalein, methyl orange and litmus.
• Fill a burette with acid and record the starting volume.
• Adds the acid from a burette until the indicator changes colour from pink to colourless (for phenolphthalein) or yellow to red (for methyl orange) or blue to red (for litmus).
• Record the final volume reading and repeat the titration until you get concordant titres.
• Pipette measures a fixed volume. burette measures variable volume.