Acid–base titrations
Acid–base titrations
- A titration finds the exact volume of one solution that reacts with another.
- Steps:
- use a pipette to measure a fixed volume into a flask,
- add a few drops of indicator,
- add the other solution from a burette, slowly, until the colour just changes.
Practice
In a titration, a fixed volume of one solution is measured using a:
A pipette measures an accurate fixed volume into the flask; the burette delivers the other solution.
Practice
A few drops of indicator are added so you can see the end-point.
The indicator changes colour at the end-point, showing the reaction is exactly complete.
The end-point
- The end-point is the moment the indicator changes colour — the reaction is exactly complete.
- Read the burette to find the volume added.
Practice
The end-point of a titration is when:
The colour change marks the exact point where the reaction is complete.
You've got it
Key idea
- a titration measures the exact reacting volume of one solution
- pipette measures the fixed volume; burette delivers the other solution to the end-point
- the end-point = the indicator's colour change (reaction complete)