WHAT IS INDICATOR? If we cannot taste every substance, how do we find its nature? Special type of substances are used to test whether a substance is acidic or basic. These substances a
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NATURAL INDICATOR – LITMUS The most commonly used natural indicator is litmus. It is extracted from lichens (Fig. 5.1a). It has a mauve (purple) colour in distilled water. When added to an ac
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NATURAL INDICATOR – TURMERIC Activity 5.2: * Take a tablespoonful of turmeric powder. Add a little water and make a paste. * Make turmeric paper by depositing tu
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NATURAL INDICATOR – CHINA ROSE Activity 5.3: * Collect some China rose (Gudhal ) petals and place them in a beaker. Add some warm water. * Keep the mi
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PHENOLPHTHALEIN We have learnt that acids turn blue litmus red and bases turn red litmus blue. Let us see what happens when an acid is mixed with a base. We are going to use an indicator you hav
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