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pH
Calculations




               Soren Sorensen
pH
Scale
Self-Ionization of Water



   H2O + H2O             H3O+ + OH-


Though pure water is considered a
non-conductor, there is a slight, but
measurable conductivity due to “self-
ionization”
Kw – Ionization Constant for Water

 In pure water at 25 C:
    [H3O+] = 1 x 10-7 mol/L
    [OH-] = 1 x 10-7 mol/L

 Kw is a constant at 25 C:
    Kw = [H3O+][OH-]

    Kw = (1 x 10-7)(1 x 10-7) = 1 x 10-14
Calculating pH, pOH
        pH = -log10(H3O+)
       pOH = -log10(OH-)

Relationship between pH and pOH
        pH + pOH = 14

Finding [H3O+], [OH-] from pH, pOH
        [H3O+] = 10-pH
         [OH-] = 10-pOH
pH + pOH = 14
P h calculations

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P h calculations

  • 1. pH Calculations Soren Sorensen
  • 3. Self-Ionization of Water H2O + H2O  H3O+ + OH- Though pure water is considered a non-conductor, there is a slight, but measurable conductivity due to “self- ionization”
  • 4. Kw – Ionization Constant for Water In pure water at 25 C: [H3O+] = 1 x 10-7 mol/L [OH-] = 1 x 10-7 mol/L Kw is a constant at 25 C: Kw = [H3O+][OH-] Kw = (1 x 10-7)(1 x 10-7) = 1 x 10-14
  • 5. Calculating pH, pOH pH = -log10(H3O+) pOH = -log10(OH-) Relationship between pH and pOH pH + pOH = 14 Finding [H3O+], [OH-] from pH, pOH [H3O+] = 10-pH [OH-] = 10-pOH
  • 6. pH + pOH = 14