Mon Prof Augmenté
Titration with a burette
Age 18 · Chemistry
Open to everyone until Sunday, November 15
To keep it, print it while it is open.
In a titration, a solution of known concentration is added slowly from a burette to a measured volume of another solution. When the indicator changes colour permanently, the equivalence point has been reached and the volume used can be read off.
In the picture
- Burette: graduated scale to read the volume of titrant added
- Stopcock: controls how fast the titrant flows out
- Drop at the tip: titrant added a little at a time near the end
- Indicator colour change: pink spreading shows the endpoint is near
- Magnetic stirrer: keeps the solution in the flask mixed
Examples
- Finding the acid concentration in vinegar using sodium hydroxide
- Checking the acidity of a fruit juice sample in a food lab
Key takeaways
- The colour change marks the endpoint, which is very close to the equivalence point.
- Adding titrant drop by drop near the end gives an accurate result.
Quiz: Titration with a burette (Age 18)
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In a titration, what does the indicator’s permanent colour change tell you?
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What do you gain by adding the titrant drop by drop near the end of a titration?
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Once the indicator has changed colour permanently, what do you read off the burette?
The answers, each with its explanation, are in the app. This quiz is free there while the lesson is in the free week.
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