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12.3 Amphoteric Substance

A substance which can act either as an acid or a base, depending on the nature of the other substance is called an amphoteric substance or amphiprotic.

Water can accept a proton and can act as a base. Similarly it can donate a proton and act as an acid.

HCl (g) + H2O H3O+ + Cl-
                Base

NH3 (g) + H2O NH4+ + OH-
                Acid

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Index

12.1 - Lowry and Bronsted Concept
12.2 - Conjugate Acid Base Pairs
12.3 - Amphoteric Substance
12.4 - Lewis Acids and Bases
12.5 - Strong and Weak Acids and Bases
12.6 - Dissociation
12.7 - Ostwald's Dilution Law
12.8 - Hydrogen Ion Concentration : pH
12.9 - Polyprotic Acids
12.10 - Salts
12.11 - Methods of Preparation of Salts
12.12 - Properties of Salts

Chapter 13





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