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OCR A-level Chemistry Titrations

Titrations

This page covers the following topics:

Titrations are a laboratory method of quantifying the concentration of a solution.

Methods of titration

This is a diagram of a titration set up.

Titration experimental set up

The result of the titration can be used to calculate the previously unkown concentration of the solution. Using the known volume and concentration from the titrant, and the ratio of moles between the two solutions in a neutralisation reaction, the concentration of the solution can be found.

Titration calculations

Titration with a weak acid, (e.g. CH₃COOH) and a strong base (e.g. NaOH) would give a titration curve. In the case where one of either acid or base is weak, and the other is strong then the equivalence point is not at pH 7.

Titration calculations

During titrations, acid-base indicators are used to indicate a neturalisation reaction has taken place. The acid and base forms of the indicator have different colours thus a colour change indicates the reation change.

Indicators

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How do you know when a neutralisation has taken place?

OCR A-level Chemistry Titrations How do you know when a neutralisation has taken place?
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2

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What are concordant results?

OCR A-level Chemistry Titrations What are concordant results?
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3

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Label the diagram.

OCR A-level Chemistry Titrations Label the diagram.
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4

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What piece of apparatus holds the titrant?

OCR A-level Chemistry Titrations What piece of apparatus holds the titrant?
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5

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What piece holds the analyte solution?

OCR A-level Chemistry Titrations What piece holds the analyte solution?
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6

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In a titration of a strong acid with a weak base, what is the pH of the equivalence point?

OCR A-level Chemistry Titrations In a titration of a strong acid with a weak base, what is the pH of the equivalence point?
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7

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Label the y-axis of this titration curve.

OCR A-level Chemistry Titrations Label the y-axis of this titration curve.
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8

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Is NHβ‚„OH a strong or weak base?

OCR A-level Chemistry Titrations Is NHβ‚„OH a strong or weak base?
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9

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In a titration with a strong acid and a strong base the pH change is from 3 - 11. Which indicator would be a good choice to use?

OCR A-level Chemistry Titrations In a titration with a strong acid and a strong base the pH change is from 3 - 11. Which indicator would be a good choice to use?
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10

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What colour would Phenolphthalein be in pH 11.0?

OCR A-level Chemistry Titrations What colour would Phenolphthalein be in pH 11.0?
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