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Vitamin C (ascorbic acid) is water soluble and is a strong reducing agent. In this laboratory activity, ascorbic acid reduces an indicator, 2,6-dichloroindophenol. The indicator solution will change from a blue color to an intermediate pink/purple color, then to a colorless/very faint amber endpoint with the addition of ascorbic acid.


  • Oxidation & Reduction
  • Nutrition
  • Consumer Chemistry