AQA · Chemistry · 8462
GCSE Chemistry: Strong and weak acids
Chemical changes · AQA GCSE Chemistry (8462), specification point 4.4.2.6. Cards are generated from the exam board's own specification for "Strong and weak acids", and every card links back to the page it came from. Higher tier only. Specification © AQA — used with attribution.
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What is a strong acid?
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An acid that is completely ionised in aqueous solution.
What is a weak acid?
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An acid that is only partially ionised in aqueous solution.
Name three examples of strong acids.
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Hydrochloric acid, nitric acid and sulfuric acid.
Name three examples of weak acids.
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Ethanoic acid, citric acid and carbonic acid.
Ethanoic acid is an example of a ? acid.
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weak
For the same concentration, how does acid strength affect pH?
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The stronger the acid, the lower the pH.
How does hydrogen ion concentration change when pH decreases by one unit?
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It increases by a factor of 10.
A decrease in pH of two units means the hydrogen ion concentration increases by a factor of ?.
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100
What do 'dilute' and 'concentrated' describe about an acid?
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The amount of substance (moles of acid) dissolved in a given volume of solution.
What do 'weak' and 'strong' describe about an acid?
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The degree of ionisation of the acid in aqueous solution.
Why is 'concentrated' not the same as 'strong' for an acid?
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Concentration is about the amount of acid per volume; strength is about how fully it ionises. A weak acid can be concentrated and a strong acid can be dilute.
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