Phenolphthalein Indicator

Phenolphthalein Indicator

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Credit: Turtle Rock Scientific/SCIENCE PHOTO LIBRARY

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Caption: Phenolphthalein indicator. Phenolphthalein indicator changes its colour depending on the pH of the solution, it turns colourless in acidic solutions and pink/fuchsia in basic solutions. Here phenolphthalein solution (centre) is added to beakers with an acidic solution (left, 0.1 M sulfuric acid, H2SO4) and an alkaline solution (right, 0.1 M potassium hydroxide, KOH).

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Keywords: acid, acidic, alkali, alkaline, base, basic, beaker, chemical, chemistry, h2so4, indicator, koh, ph indicator, phenolphthalein, potassium hydroxide, solution, sulfuric acid

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