Acid-Base Titration and pH Chemistry Chapter 16 Acid-Base Titration and pH

Self-Ionization of Water H2O + H2O  H3O+ + OH-

Ion Concentration in Water

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

H+, OH-, and pH

pH Scale

Relationship between pH and pOH 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

Measuring pH with wide-range paper

Narrow-Range pH Paper

pH Indicators and their ranges

Titration Calculations

Titration Curves