AQA · Chemistry · 8462
GCSE Chemistry: The pH scale and neutralisation
Chemical changes · AQA GCSE Chemistry (8462), specification point 4.4.2.4. Cards are generated from the exam board's own specification for "The pH scale and neutralisation", and every card links back to the page it came from. Specification © AQA — used with attribution.
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Which ion do acids produce in aqueous solution?
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Hydrogen ions (H+).
Which ion do aqueous solutions of alkalis contain?
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Hydroxide ions (OH−).
The pH scale runs from 0 to ?.
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14
What does the pH scale measure?
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The acidity or alkalinity of a solution.
Name two ways of measuring the pH of a solution.
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Universal indicator (or a wide-range indicator) and a pH probe.
What pH value is neutral?
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pH 7.
What range of pH values do aqueous acids have?
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Less than 7.
What range of pH values do aqueous alkalis have?
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Greater than 7.
What product forms when hydrogen ions react with hydroxide ions in neutralisation?
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Water.
Write the ionic equation for the neutralisation of an acid by an alkali.
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H+(aq) + OH−(aq) → H2O(l)
Why does a pH probe give a more precise pH than universal indicator?
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A probe gives a numerical reading; universal indicator only gives an approximate pH by colour matching.
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