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The pH Scale & Indicators

pH=−log⁡10[H+]\text{pH} = -\log_{10}[H^+]
pH4.0
[H⁺] concentration1.0e-4 mol/dm³
ClassificationWeakly acidic
  • Find a strongly acidic solution (pH below 3)
  • Find a strongly alkaline solution (pH above 11)
  • Find the pH where phenolphthalein first turns pink
  • Find a pH where methyl orange is still RED (not yet orange or yellow)
  • Find a weakly acidic solution where phenolphthalein is colourless but litmus is already red