Ask Question
9 June, 19:39

Why does phenolphthalein turn pink

+2
Answers (1)
  1. 9 June, 20:44
    0
    Because phenolphthalein is an an indicator, and an indicator really is a weak organic acid/base with different colors for its conjugate acid and base forms.

    It happens that phenolphthalein has the equilibrium HIn + H2O ⇄ In⁻ + H3O⁺ where the color of HIn is colorless and the color of In⁻ is pink.

    In basic solutions, the OH⁻ from the bases will combine with the H3O⁺ to form H2O. This leads to decrease in [H3O⁺] so Le Chatelier's principle says that equilibrium will shift to the right to compensate. This makes the overall solution turn pink.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “Why does phenolphthalein turn pink ...” in 📘 Chemistry if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers