Chemistry
Grade-10
Easy
Question
An indicator paper is prepared by dipping paper strips in solution (P). When this strip of indicator is added to the solution (Q), which contains less H+ ions than the OH- ions, the color of the paper strip turns pink. Identify the solution (P).
- Methyl orange
- Phenolphthalein
- Red litmus solution
- Red cabbage juice
Hint:
Phenolphthalein turns pink in basic solution.
The correct answer is: Phenolphthalein
The solution (Q), which contains less H+ ions than the OH- ions is supposed to be base. The color of the paper strip turns pink, solution P is possibly phenolphthalein.
Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.
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