# pH Calculatio ns Soren Sorensen pH Scal e

pH Calculatio ns Soren Sorensen pH

Scal e 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 1014 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

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