Explain strong acid and weak acid and also illustrate with examples.

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llltkl's profile pic

llltkl | College Teacher | (Level 3) Valedictorian

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Acids (and bases) are classified into strong or weak ones depending upon their degree of dissociation (ionization) in solution. Those having strong tendency to ionize are called strong acids and those having lesser tendency to ionize are weak acids. Infact strong acids remain completely ionized in solution (degree of ionization = 100%). HCl, H2SO4, HNO3 and HClO4 – these four acids are strong. Organic carboxylic acids, e.g. aetic acid, oxalic acid, citric acid or salicylic acid, on the other hand, ionize partially in solution, hence they are called weak acids. Their relative strength (or weakness) can be expressed in terms of the acid dissociation constant Ka which is the equilibrium constant for the ionization reaction


Thus oxalic acid with Ka(1) = 5.8×10˄-2 is a relatively stronger acid than acetic acid (Ka = 1.8×10˄-5).

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chaobas | College Teacher | (Level 1) Valedictorian

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Strons acid are those acid which has 100 % of degree of ionization like H2SO4

H2SO4 ======> 2 H{+}  + SO4{2-}

H2SO4 in solution completely disassociate into its ions. So it is a strong acid.


Whereas Weak acid are those acid, which are not completely diassocaited. Like acetic aicd.


CH3COOH <=======>  CH3COO{-} +  H{+}


These weak aicd will have it s Ka value which is acid disassociation constant.

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abhi4307 | Student, Grade 11 | (Level 1) Valedictorian

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Strong acids are those acids in which there is less amount of water than the amount of acid.

E.g.- Sulphuric acid(H2SO4), Nitric Acid(HNO3), etc.

Weak acids are those acids in which the amount of water is relatively high than the amount of water.

E.g- Acetic acid(CH3COOH), Oxalic acid(H2C2O4), etc.

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