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SQA National 5 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?

SQA National 5 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?

SQA National 5 Chemistry Titrations What are concordant results?
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3

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Label the diagram.

SQA National 5 Chemistry Titrations Label the diagram.
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4

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What piece of apparatus holds the titrant?

SQA National 5 Chemistry Titrations What piece of apparatus holds the titrant?
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5

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What piece holds the analyte solution?

SQA National 5 Chemistry Titrations What piece holds the analyte solution?
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6

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In a titration, 25.00 cmΒ³ of sodium hydroxide acid (0.100 mol/dmΒ³) is neutralised by 20.00 cmΒ³ of dilute hydrochloric acid. Calculate the concentration of the hydrochloric acid to 3 decimal places.

SQA National 5 Chemistry Titrations In a titration, 25.00 cmΒ³ of sodium hydroxide acid (0.100 mol/dmΒ³) is neutralised by 20.00 cmΒ³ of dilute hydrochloric acid. Calculate the concentration of the hydrochloric acid to 3 decimal places.
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7

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100 mL of 0.25M barium hydroxide are required to titrate 100 mL of sulfuric acid. What is the concentration of the acid?

SQA National 5 Chemistry Titrations 100 mL of 0.25M barium hydroxide are required to titrate 100 mL of sulfuric acid. What is the concentration of the acid?
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8

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Convert 0.025 dm3 into mL.

SQA National 5 Chemistry Titrations Convert 0.025 dm3 into mL.
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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?

SQA National 5 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?

SQA National 5 Chemistry Titrations What colour would Phenolphthalein be in pH 11.0?
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