When substances dissolve in water they dissociate into their individual ions
Indicators are dyes that change colour depending on whether they are acidic or alkaline solutions
- Litmus changes colour from red to blue. Universal indicator is a mixture of dyes that shows a range of colours to indicate how acidic/alkaline a substance is.
soluble bases are called alkalis, acids are neutralised by bases
soluble salts can be made by reacting acids with insoluble bases such as metal oxides, metal hydroxides and metal carbonates. Strong acids such as hydrochloric acid, nitric acid and sulfuric acid are completely ionised in water. Weak acids such as ethanoic acid, citric acid and carbonic acid are only partially ionised in water.
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