Question

(i) Define a universal indicator. Mention its one use. (ii) Solution A gives pink colour when a drop of phenolphthalein indicator is added to it. Solution B gives red colour when a drop of methyl orange is added to it. What type of solutions are A and B and which one of the solutions A and B will have a higher pH value? (iii) Name one salt whose solution has pH more than 7 and one salt whose solution has pH less than 7.

Answer 1

Answer:

answer 2

(b) Solution A gives pink colour when a drop of phenolphthalein indicator is added, therefore A is a base. Solution B gives red colour when a drop of methyl orange is added to it, therefore B is an acid. Hence, solution A will have less concentration of hydrogen ion than B.

answer1

The common indicator cannot give us the strength of acid and base. To measure the strength of acid and bases we need a universal indicator.

Universal indicator is a mixture of different indicators which give different colour at different pH value of entire scale

Explanation:

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Answer 2

Answer:

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