• The pH of a solution is the negative logarithm of the hydrogen-ion concentration.
  • In pure water or a neutral solution the [H+] = 1.0 × 10-7 M. Solutions whose pH is less than 7 are acidic, while those with a pH higher than seven are basic.
  • The pH of coffee is 9.3, which is acidic or basic.
  • If a material has a pH of 9.2, is it acidic orbasic?
  • If it is acidic, it is basic.
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