Subjects
Sections | |||
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Identifying Acids and Bases | 52 mins | 0 completed | Learn Summary |
Arrhenius Acid and Base | 7 mins | 0 completed | Learn Summary |
Bronsted Lowry Acid and Base | 18 mins | 0 completed | Learn Summary |
Amphoteric | 6 mins | 0 completed | Learn |
Lewis Acid and Base | 14 mins | 0 completed | Learn Summary |
pH and pOH | 64 mins | 0 completed | Learn Summary |
Ka and Kb | 21 mins | 0 completed | Learn |
Ionic Salts | 46 mins | 0 completed | Learn |
Diprotic Acid | 31 mins | 0 completed | Learn Summary |
Polyprotic Acid | 24 mins | 0 completed | Learn |
Additional Practice |
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Strong Acid-Base Calculations |
Weak Acids |
Additional Guides |
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Strong Acids and Strong Bases (IGNORE) |
Conjugate Acids and Bases |
Weak Bases |
A polyprotic acid possesses more than 2 hydronium ions (H+).
Our understanding of diprotic acids and bases can be used to understand polyprotic acids and bases.
Concept #1: The most common type of polyprotic acid is the triprotic acid, which contains 3 acidic hydronium ions.
Concept #2: Triprotic bases contain 3 Kb values, so they would have 3 equilibrium equations.
Concept #3: As a result of these equations for polyprotic acids and bases the relationship between Ka and Kb can be established.
Example #1: Determine the pH of 0.300 M sodium hydrogen phosphate, Na2HPO4. Phosphoric acid, H3PO4, contains Ka1 = 7.5 x 10-3, Ka2 = 6.2 x 10-8 and Ka3 = 4.2 x 10-13.
Example #2: Determine the pH of 0.300 M citric acid, H3C6H5O7 it possesses Ka1 = 7.4 x 10-4, Ka2 = 1.7 x 10-5 and Ka3 = 4.0 x 10-7.
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