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Ch.15 - Acid and Base EquilibriumWorksheetSee all chapters

# Diprotic Acids and Bases Calculations

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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

Diprotic Acids and Bases require ICE Charts to determine their pH and pOH respectively

###### Diprotic Acids and Bases Calculations

Concept #1: Sulfuric acid represents the only strong diprotic acid

Example #1: Calculate the pH of a 0.0550 M H2SO4 solution. Ka1 = 1.0 x 103 and Ka2 = 1.2 x 10-2.

Example #2: Calculate the pH of a 0.115 M carbonic acid, H2CO3, solution. Ka1 = 4.3 x 10-7 and Ka2 = 5.6 x 10-11.

Example #3: Determine the [CO32–] when given 0.115 M carbonic acid, HCO3, solution. Ka1 = 4.3 x 10-7 and Ka2 = 5.6 x 10-11.

Practice: Sulfurous acid, H2SO3, represents a diprotic acid with a Ka1 = 1.6 × 102 and Ka2 = 4.6 × 105. Calculate the pH when given 0.200 M H2SO3.

Practice: Determine the pH of 0.115 M Na2S. Hydrosulfuric acid, H2S, possesses Ka1 = 1.0 × 107 and Ka2 = 9.1 × 108.