Titrations (AQA GCSE Chemistry)
Revision Note
Titration
What titrations are used for
Titrations are a method of analysing the concentration of solutions
Acid-base titrations are one of the most important kinds of titrations
They can determine exactly how much alkali is needed to neutralise a quantity of acid – and vice versa
You may be asked to calculate the moles present in a given amount, the concentration or volume required to neutralise an acid or a base
Types of titrations
Titrations can also be used to prepare salts or other precipitates and in redox reactions
Indicators are used to show the endpoint in a titration
Wide range indicators such as litmus are not suitable for a titration as they do not give a sharp enough colour change at the end point
Some of the most common indicators with their corresponding colours are shown below
Common indicators and their corresponding colours table
Indicator | Colour in acid | Colour in alkali | Colour in neutral |
|---|---|---|---|
Litmus solution | Red | Blue | Purple |
Litmus paper: red | Stays red | Turns blue | No change |
Litmus paper: blue | Turns red | Stays blue | No change |
Methyl orange | Red | Yellow | Orange |
Phenolphthalein | Colourless | Pink | Colourless |
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