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Chemistry

Give three reasons with equations wherever required, why Sulphuric acid is a dibasic acid.

Acids Bases Salts

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Answer

Sulphuric acid (H2SO4) is a dibasic acid as :

  1. It ionises in aq. soln. to produce two hydrogen ions per molecule of the acid.
  2. It dissociate in two steps in aq. soln. as shown below:
    H2SO4 + H2O ⇌ H3O+ + HSO4-
    HSO4- + H2O ⇌ H3O+ + SO42-
    H2SO4 + 2H2O ⇌ 2H3O+ + SO42-
  3. It contains two replaceable hydrogen ions per molecule of the acid so forms two types of salt [acid and normal salt] :
    NaOH + H2SO4 ⟶ NaHSO4 (Acid Salt) + H2O
    2NaOH + H2SO4 ⟶ Na2SO4 (Normal Salt) + 2H2O

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