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Tài liệu Chapter 10: Polyprotic Acid-Base Equilibria pptx
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Mô tả chi tiết
Chapter 11:
Acid-Base Titrations
Chapter 10:
Polyprotic Acid-Base Equilibria
1. Treating Complex Acid-Base Systems
Complex systems are defined as solutions made up of:
1) Two acids or bases of different strengths
HCl + CH3COOH
NaOH + CH3COO2) An acid or base that has two or more acidic
protons or basic functional groups
H3PO4
Ca(OH)2
3) An amphiprotic substance that is capable of acting
as both acid and base
HCO
3
- + H
2O <=> CO
3
2- + H
3
O+
HCO
3
- + H
2O <=> H
2CO
3 + OHN
H
3
+CH
2COO- + H
2O <=> NH
2CH
2COO- + H
3
O
+
N
H
3
+CH
2COO- + H
2O <=> NH
3
+CH
2COOH + OH
-
2. Equations for more than one equilibrium are
required to describe the characteristics of any of
these systems.