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pH Calculations

pH Calculations. Soren Sorensen. pH Scale. Self-Ionization of Water. H 2 O + H 2 O  H 3 O + + OH -. Though pure water is considered a non-conductor, there is a slight, but measurable conductivity due to “self-ionization”. K w – Ionization Constant for Water.

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pH Calculations

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  1. pH Calculations Soren Sorensen

  2. pH Scale

  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

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