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Ch.15 - Acid and Base EquilibriumWorksheetSee all chapters

# Auto-Ionization

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Sections
Acids Introduction
Bases Introduction
Binary Acids
Oxyacids
Bases
Amphoteric Species
Arrhenius Acids and Bases
Bronsted-Lowry Acids and Bases
Lewis Acids and Bases
The pH Scale
Auto-Ionization
Ka and Kb
pH of Strong Acids and Bases
Ionic Salts
pH of Weak Acids
pH of Weak Bases
Diprotic Acids and Bases
Diprotic Acids and Bases Calculations
Triprotic Acids and Bases
Triprotic Acids and Bases Calculations
Conjugate Acids and Bases

Auto-ionization is when one water molecule acts as an acid and another acts as a base.

###### Auto-Ionization

Concept #1: Through auto-ionization the ionization constant of water can be determined.

Concept #2: Like other equilibrium constants, Kw is also affected by changes in temperature.

Example #1: A particular aqueous solution at 50ºC contains 3.7 x 10-4 M of hydronium ions. Calculate the [OH-] and identify solution as acidic, basic, or neutral.

Practice: Chemistry student prepared an aqueous solution at 30ºC. If the solutions contains 7.42 × 10−9 M of hydroxide ions, calculate the pH.

Practice: Calculate the Kw of pure water given the pH = 6.34.