Acid-Base TitrationsCambridge IGCSE Chemistry: Flashcards
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What piece of apparatus is used to add a variable, measured volume of solution during a titration?
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- What piece of apparatus is used to add a variable, measured volume of solution during a titration?
- A burette.
- What piece of apparatus is used to measure one fixed, precise volume of solution?
- A volumetric pipette.
- What is added to the flask to detect the end-point of a titration?
- A suitable indicator.
- How is the end-point of a titration identified?
- By the colour change of the indicator.
- Describe the basic method of an acid-base titration.
- Pipette a fixed volume of one solution into a flask, add indicator, then add the other solution from a burette until the indicator just changes colour, and record the volume used.
- Why is a volumetric pipette used instead of a measuring cylinder in a titration?
- A volumetric pipette measures a fixed volume much more precisely than a measuring cylinder.
- What is a disadvantage of using an indicator to find the end-point?
- The colour change can be harder to judge accurately, especially with coloured solutions.
- Why is a burette used rather than a pipette to add the second solution?
- A burette allows a precise but variable volume to be added slowly, so the exact volume needed to reach the end-point can be measured.
- What is the purpose of a titration?
- To accurately measure the volume of one solution needed to react exactly with a known volume of another.
- Why might you carry out a rough titration before a precise one?
- To find an approximate end-point volume, so the precise titration can be done more accurately by adding drop-by-drop near that point.
- Name three general pieces of apparatus used in experimental chemistry measurement.
- Any three of: stopwatches, thermometers, balances, burettes, volumetric pipettes, measuring cylinders, gas syringes.
- What does 'end-point' mean in a titration?
- The point at which the indicator changes colour, showing the reaction is (approximately) complete.