Collect some China rose (Gudhal) petals and place them in a beaker. Add some Fig. 5.3 China rose flower and indicator prepared from it Table 5.3 S. No. Test solution Effect on turmeric solution Remarks 1 2. Lemon juice Orange juice Vinegar Milk of magnesia 3. 4. 5 Baking soda 6. Lime water 7. Sugar Common salt 8. 52 SCIENCE
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Special type of substances are used to test whether a substance is acidic or basic. These substances are known as indicators. The indicators change their colour when added to a solution containing an acidic or a basic substance. Turmeric, litmus, China rose petals (Gudhal), etc., are some of the naturally occurring indicators.
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