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Titration Colour Change

A burette delivers liquid drop by drop into a flask. An indicator in the flask changes colour when the added amount reaches the equivalence point.

In the picture

  1. Stopcock: the valve that controls drops leaving the burette
  2. Burette scale: the volume markings used to read how much liquid has been added
  3. Flask liquid: the pale pink colour produced by the indicator at the change point
  4. White tile: the plain background that makes the liquid colour easier to see

Examples

  • Adding vinegar to red cabbage water until it turns pink
  • Testing swimming pool water with a colour-change test kit

Quiz: Titration Colour Change (Age 16)

  1. At what point does the indicator change colour in a titration?

    • Only after the stopcock is closed
    • Immediately after the first drop is added
    • At the equivalence point
  2. How is the volume of titrant used found from a burette?

    • By counting how many drops fall into the flask
    • By reading the burette before and after the titration
    • By measuring the colour of the flask liquid
  3. What is the white tile used for in this titration setup?

    • To show how much liquid has been added
    • To make the liquid colour easier to see
    • To control the drops leaving the burette

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.

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Chemistry, Age 16