An aqueous solution 'A' turns phenolphthalein solution pink. On addition of an aqueous solution 'B' to 'A', the pink colour disappears. The following statement is true for solution 'A' and 'B'.
a. A is strongly basic and B is a weak base
b. A is strongly acidic and b is a weak acid
c. A has pH greater than 7 and B has pHless than 7
d. A has pH less than 7 an B has pH greater than 7
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Answered by
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The true statement for solution 'A' and 'B' is:
c. A has pH greater than 7 and B has pH less than 7.
- The indicator phenolphthalein works in the basic solutions.
- It means in this pH range, the solution will change its colour to pink.
- So, solution A must lie in the pH range of above 7.
- When we add a solution with pH less than 7, then the pH of the final solution will decrease.
- Phenolphthalein will not work anymore in the lower pH range and the solution becomes colourless.
- So, the pH of solution B must be less than 7.
- Hence, the correct answer is option (c).
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Answer:
a has a pH greater than 7 and b has pH less than 7
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