Q6 of 45 Page 2

What is an universal indicator?

Universal indicator is a solution, which undergoes several colour, changes over a wide range of pH. The colour is used to 'indicate' pH directly. Universal indicators are usually mixtures of several indicators.

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4 What are the practical applications of neutralisation reactions? 5 Why the salts solutions of strong acid and strong alkali are neutral? 7 Why common indicators cannot determine pH value of a solution? 8 What are the general characteristics of acids?