Two solutions A and B have pH values 3 and 8 respectively. Which one of these two will give a pink colour with phenolphthalein indicator?

Answer

To determine which solution will give a pink color with phenolphthalein indicator, we can follow these steps:

### Step 1: Understand the pH Values
- Solution A has a pH of 3.
- Solution B has a pH of 8.

### Step 2: Classify the Solutions Based on pH
- A solution with a pH less than 7 is considered acidic. Therefore, Solution A (pH 3) is acidic.
- A solution with a pH greater than 7 is considered basic (or alkaline). Therefore, Solution B (pH 8) is basic.

### Step 3: Know the Behavior of Phenolphthalein
- Phenolphthalein is an acid-base indicator that is colorless in acidic solutions (pH < 7) and turns pink in basic solutions (pH > 7).

### Step 4: Analyze the Solutions with Phenolphthalein
- Since Solution A is acidic (pH 3), it will not change color and will remain colorless with phenolphthalein.
- Since Solution B is basic (pH 8), it will turn pink when phenolphthalein is added.

### Conclusion
- The solution that will give a pink color with phenolphthalein indicator is Solution B.

### Final Answer
**Solution B will give a pink color with phenolphthalein indicator.**

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