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Grade 8Physical Chemistry

discuss the hydrolysis of the following types of salt solutions.
a]salt of weak acid and strong base
b]strong acid and weak base

Profile image of mgayathri
10 Years agoGrade 8
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1 Answer

Profile image of Vikas TU
10 Years ago
  1. The salt of a weak acid and strong base undergoes hydrolysis in water to produce additional OH- ions.

    For example, sodium acetate in water is hydrolysed as per the equation:
             Na(+) + CH3COO(-) + H2O = Na(+) + CH3COOH + OH(-).
    Since acetic acid is a weak acid, it remains unionised in solution and the OH- ions make the solution basic or alkaline.

    Similarly, a salt of a strong acid and weak base is acidic in aqueous solution. Here, the cation undergoes hydrolysis to form additional H+ ions., along with undissociated weak base.

    Only aqueous solutions of salts of strong acids and strong bases have a pH value of 7, as they do not undergo hydrolysis.
     

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