What does "titrate solution A with solution B" mean?
A should be in the conical flask, and B should be in the burette.
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Why is a conical flask used instead of a beaker?
A conical flask has a narrower neck, so it is easier to swirl the mixture without spilling the contents.
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Why should the burette be rinsed out with the solution to be put in it?
So that the solution added is not diluted by residual water or reacted with substances left from a previous titration. This would lead to the concentration of the substance being lowered and therefore a larger titre being delivered.
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Why should the funnel not be left in the burette?
Small drops of liquid may fall from the funnel during the titration, leading to a false burette reading (would give a lower titre volume).
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Why does the jet space in the burette need to be filled with solution before commencing the titration?
If the jet space is not filled it will lead to errors if it is then filled during the titration, leading to a larger than expected titre reading.
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Why should burette readings always be given to 2dp. ending in 0.00 or 0.05?
This is the volume of 1 drop of solution delivered from a burette and is therefore the smallest difference in readings that can be measured.
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Why should only a few drops of indicator be added?
Indicators are generally weak acids - they may affect the titration result if too much is added.
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Why can distilled water be used to rinse the sides of the conical flask (so that all of the solution of known conc. is washed into the reaction mixture)?
Distilled water does not react with the reagents or change the number of moles of known solution added.
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Why are titrations repeated?
So that anomalous titres can be spotted and discounted.
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Which results are used in calculating an average?
Concordant results
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What can be said about the results if they are concordant?
The results are accurate and repeatable and the titration technique is good and consistent.
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What must be considered when titrating a mixture to work out the concentration of an active ingredient?
If the mixture contains other substances that have acid base properties. If it doesn't then we can titrate with confidence.
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Why must several samples be titrated in quality control?
To ensure that the concentration of the chemical being tested doesn't vary too much between samples.
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Other cards in this set
Card 2
Front
Why is a conical flask used instead of a beaker?
Back
A conical flask has a narrower neck, so it is easier to swirl the mixture without spilling the contents.
Card 3
Front
Why should the burette be rinsed out with the solution to be put in it?
Back
Card 4
Front
Why should the funnel not be left in the burette?
Back
Card 5
Front
Why does the jet space in the burette need to be filled with solution before commencing the titration?
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