pH Scale

This is a measurement of the acidity and basity of a solution.

The pH of a solution is defined as:

The negative logarithm of the concentration of hydrogen ions in solution.

pH = -log[H+]

  • As conc. hydrogen ions increase, pH decreases
  • pH + pOH = 14
  • A neutral solution has equal concentrations of OH- and H+ ions ; pH = 7
  • Do not take into account the pH of water unless very large quantities




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