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12.9 Polyprotic Acids

Polyprotic acids can be defined as those acids that contain more than one acid hydrogen (proton) per molecule.

e.g. H2SO4, Oxalic acid (H2C2O4), H3PO4, arsenic acid (H3HSO4)

These acids ionize in a step wise manner (number of steps depends on number of acid hydrogen) and there is an ionization constant for each step.


In all polyprotic acids

K1 > K2 > K3

i.e. primary ionization is stronger than secondary which is in turn stronger than tertiary.

The ionization constant of some polyprotic acids are given in the following table:

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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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