Substances that are used to determine whether a particular substance is an acid or a base are called ___.

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Solution

Indicators are the special type of substances which are used to identify acids, bases and neutral solutions by showing a change in colour. We use an indicator because we cannot check the nature of every substance by tasting it.

Few examples of indicators are litmus, turmeric, China rose extract, phenolphthalein, methyl orange etc.

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