Starter quiz
- What is titration used for in chemistry?
- To completely neutralise an acid with an alkali. ✓
- To mix acids and alkalis randomly.
- To measure the pH of a solution.
- To heat up acids and alkalis.
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- Match the following terms from titrations to their correct definitions.
- titration⇔A technique to find volumes of reacting solutions. ✓
- volume⇔The space matter occupies, often in cm³. ✓
- end point⇔When enough solution is added for a complete reaction. ✓
- strong acid⇔An acid that fully ionises in water. ✓
- What is the curve on the surface of a liquid in a container called?
- 'meniscus' ✓
- How do you know the end point of a titration has been reached?
- The indicator changes colour and stays that colour. ✓
- The solution becomes cloudy.
- The indicator changes colour briefly, then fades.
- The volume of acid stops changing.
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- Which of the following statements about strong acids in water is correct?
- They do not ionise at all.
- They partially ionise.
- They ionise completely. ✓
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- Which of the following indicators are suitable to use in a titration?
- universal indicator
- litmus paper
- phenolphthalein ✓
- methyl orange ✓
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Exit quiz
- Match the following key terms to its definition.
- titrant⇔Solution of known concentration in the burette. ✓
- analyte⇔Solution of unknown concentration in the conical flask. ✓
- concentration⇔Amount of solute dissolved in a solvent. ✓
- concordant⇔Titres within ±0.10 cm³ of each other. ✓
- titre⇔Volume of titrant needed to reach the end point. ✓
- Why is it important to perform a trial titration first?
- To heat up the solution.
- To estimate how much acid to add. ✓
- To get a colour change faster.
- To neutralise the alkali quickly.
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- Why is acid added drop by drop near the end point in titration?
- To speed up the reaction.
- To make the solution more concentrated.
- To reduce splashing.
- To ensure accuracy. ✓
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- Sort the steps of a titration into the correct order, starting with performing a trial titration.
- 1⇔Perform a trial titration to estimate the amount of titrant needed.
- 2⇔Fill the burette with the titrant (acid).
- 3⇔Add the analyte (alkali) to the conical flask.
- 4⇔Add indicator to the analyte in the flask.
- 5⇔Begin adding titrant quickly from the burette.
- 6⇔Slow down and add drop by drop near the end point.
- 7⇔Stop when the indicator changes colour and stays that colour.
- At what point should you take the volume reading from a burette?
- Centre of the solution.
- Bottom of the meniscus. ✓
- Top of the liquid.
- From the edge of the meniscus.
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- What does it mean if titres are concordant?
- They differ by more than 0.10 cm³.
- They differ by less than 0.10 cm³. ✓
- They are exactly the same.
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- In a titration, a trial investigation helps estimate the amount of acid needed to neutralise the alkali.
- Near the end point, add the acid drop by drop whilst swirling the solution in the conical flask to mix.
- Placing a white tile under the conical flask enhances the visibility of the colour change and accuracy of readings.
- Volume readings should be taken at eye level from the bottom of the meniscus.
- Concordant titres are typically within ±0.10 cm³.
Common misconception
Pupils often believe that any small colour change signals the end point, leading to inaccurate titrations.
Emphasise the importance of adding the titrant drop by drop near the end point and ensure pupils understand that the end point is reached only when the colour change is persistent.
Keywords
Titrant - the solution of known concentration added from the burette in titration
Analyte - the solution of unknown concentration in the conical flask in titration
Concentration - the amount of a solute dissolved in a certain volume of solvent
Concordant - readings within a certain range; for titrations, these usually need to be within ±0.10 cm³ of each other
Titre - the volume of titrant needed to reach the end point in a titration
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