Acids, Bases and Salts · Class 10 · CBSE Science
What is observed when a few drops of phenolphthalein are added to a dilute solution of sodium hydroxide, followed by the dropwise addition of dilute…
Practice question from Acids, Bases and Salts (Class 10 · CBSE Science), with the correct answer and a step-by-step solution.
medium · MCQ · Q-72AAE5
What is observed when a few drops of phenolphthalein are added to a dilute solution of sodium hydroxide, followed by the dropwise addition of dilute hydrochloric acid until the mixture becomes colorless?
- A.The solution turns pink initially and remains pink throughout.
- B.The solution turns pink initially and becomes colorless when sufficient acid is added.Correct answer
- C.The solution remains colorless throughout the process.
- D.The solution turns yellow when acid is added.
Solution
Phenolphthalein turns pink in a basic medium (sodium hydroxide). When dilute hydrochloric acid is added gradually, neutralization occurs, and the solution becomes colorless once the base is completely neutralized.
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