What is the colour of phenolphthalein in base?
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Answer # 1 #
Phenolphthalein turns a beautiful pink or magenta color in basic solutions! It's actually one of the most classic chemistry demonstrations - the indicator is colorless in acidic and neutral solutions but when you add it to a base like sodium hydroxide, it instantly changes to that characteristic pink hue. The color change typically occurs around pH 8.2 to 10.0, making it perfect for detecting weak bases. If you make the solution strongly basic, the color might eventually fade again. It's such a satisfying visual that makes acid-base chemistry come alive in the lab!