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Universal indicator can be used to illustrate an entire range of pH conditions because it is made up of a mixture of different indicators that change color at different pH values. As an acid is diluted with water, its pH increases— but never above pH 7. Likewise, as a base is diluted, its pH decreases—but, again, never below pH 7.

Concepts

  • Scientific Method
  • Diffusion
  • Acids & Bases
  • Indicators
  • pH