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Indicators

The two indicators most commonly used are methyl orange and phenolphthalein.
Methyl orange is red in acid and yellow in alkali.It can be used to titrate a strong acid like hydrochloric, nitric or sulfuric acid against a strong base such as sodium hydroxide or weak base such as sodium carbonate.
Phenolphthalein is colourless in acid and pink in alkali.It can be used to titrate a strong base such as sodium hydroxide with a weak acid such as ethanoic acid or a strong acid such as hydrochloric acid.

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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 5: Formulae, Equations and Amounts of Substance. Topic: Amount of Substance and Calculations.

Key terms in this lesson

strong acid
An acid that dissociates (ionises) completely in aqueous solution.
weak acid
An acid that only partially dissociates (ionises) in aqueous solution.

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