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Phenolphthalein Indicator Solution

How To Make Phenolphthalein pH Indicator

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Phenolphthalein indicator displays a rainbow of colors.

Phenolphthalein indicator displays a rainbow of colors.

David Freund, Getty Images This is the chemical structure of phenolphthalein.

This is the chemical structure of phenolphthalein.

Ben Mills/PD

This is a recipe for making 100 mL of phenolphthalein pH indicator solution.

Materials

  • 0.05 g phenolphthalein [3,3-bis( p-hydroxyphenyl)phthalide]
  • 95% ethanol
  • distilled water

Procedure

  1. Dissolve 0.05 g phenophthalein in 50 mL of 95% ethanol.

     

  2. Dilute the solution to 100 mL with distilled water.

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