The acids on the basis of their capacity and rate of ionization are divided into two kinds i.e., strong acids and weak acids. Such acids that cannot be ionized fully in the aqueous solution are termed as the weak acids. The hydrolysis of an acid normally results in the dissociation of the acid and therefore, the positive and the negative ions are formed.
The ionization reactions of the weak acids are generally reversible and the protons and the negative ion i.e., anion tends to react and reform the acid. And most of the time the reverse reaction is more successful than the forward reaction.
Examples of Weak Acids:
Most of the organic acids like ethanoic acid, oxalic acid, etc. are weak acids. An inorganic acid, HF (hydrogen fluoride) is also a weak acid.
Table 1.2 in The Chemical Composition of Soils (Helmke
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