12.2 Acid-Base Titrations (Cambridge (CIE) O Level Chemistry): Flashcards
Exam code: 5070
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What is a titration used to determine?
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What is a titration used to determine?
A titration is a method used to determine the concentration of a solution by reacting a known volume of it with a solution of known concentration until neutralisation is complete.
In a titration, burette readings are recorded to the nearest ______ cm3, and the second decimal place is always ______ or 5.
In a titration, burette readings are recorded to the nearest 0.05 cm3, and the second decimal place is always 0 or 5.
Why is litmus not suitable as an indicator in a titration?
Litmus is not suitable as a titration indicator because it does not give a sharp enough colour change at the endpoint, making it difficult to identify the exact point of neutralisation.
Concordant titration results are two readings that are within ______ cm3 of each other.
Concordant titration results are two readings that are within 0.1 cm3 of each other.
True or False?
The fixed volume of solution placed in the conical flask during a titration is measured using a burette.
False.
The fixed volume is measured using a volumetric pipette, while the burette is used to deliver the variable volume being added drop by drop.
In a titration, the endpoint is identified by a ______ colour change of the ______.
In a titration, the endpoint is identified by a sharp colour change of the indicator.
State two suitable indicators for an acid-base titration and explain why litmus is not used.
Methyl orange and phenolphthalein are suitable for acid-base titrations because they produce a sharp colour change at the endpoint, unlike litmus, which gives a gradual change that cannot be pinpointed precisely.
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