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    Chemistry GCSE

    Acid

    What Acid means in Chemistry GCSE, as defined for Pearson Edexcel.

    Definition of Acid

    A substance that produces hydrogen ions ($H^+$) when dissolved in aqueous solution.
    Pearson Edexcel · Chemical changes (study guide)

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    Using Acid in the exam

    Definition questions usually carry one or two marks, and examiners look for the precise wording. Write the definition from memory, check it against the version above, and then use the term in a longer answer on the same topic so it sticks.

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