• A solution is a mixture of two or more substances that has the same composition throughout.
  • Some solutions are acids and some are bases.
  • The concentration of hydronium ions in a solution is known as acidity.
  • Pure water has a pH of 7, so the point of neutrality on the pH scale is 7.
  • Acids have a pH lower than 7, and bases have a pH higher than 7.
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