Chemistry
HCl, HNO3, C2H5OH, C6H12O6 all contain H atoms but only HCl and HNO3 show acidic character. Why?
Acids Bases Salts
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Answer
HCl and HNO3 show acidic character because they ionise in aqueous solution.
Ionisation of HCl in water:
HCl ⟶ H+ + Cl-
H+ + H2O ⟶ H3O+
Ionisation of HNO3 in water:
HNO3 ⟶ H+ + NO3-
H+ + H2O ⟶ H3O+
C2H5OH (Ethanol) and C6H12O6 (Glucose) are covalent compounds. Their H atoms do not ionise in water to form hydronium ions [H3O+]. Hence, they don't show acidic character.
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