Titrations (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards

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Titrations
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Definition of titrations

Technique to determine concentration by reacting with a solution of known concentration

Purpose of titrations in acid-base chemistry

Determine amount of base needed to neutralise acid or vice versa

What is the analyte in titration

Substance whose concentration you want to determine

Purpose of indicator in titration

Changes colour when analyte is completely neutralised

What is a burette

Instrument used to deliver titrant into analyte

How to prepare burette before titration

Rinse with titrant, then fill ensuring jet space is filled

Why fill jet space of burette

Prevents inaccurate volume readings

Initial burette reading position

Bottom of meniscus at 00 cm³ mark

Why swirl flask during titration

To mix solutions thoroughly

What signals titration endpoint

Indicator permanently changes colour

Definition of titre

Volume of titrant used from initial to final reading

What are concordant titres

Results within 0.200.20 cm³ of each other

Minimum number of titration repetitions

At least three times

Burette reading precision

To nearest 0.050.05 cm³

Where does burette scale start

00 cm³ at the top

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