What is buffer action
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Posted by Ankita Singh 6 years, 4 months ago
- 3 answers
Manjeet Singh 6 years, 4 months ago
Amar Kumar 6 years, 4 months ago
Buffer action: the ability of the buffer solution to resist the changes in pH value on the addition of small amount of an acid or a base is known as buffer action.
For example: consider an acidic buffer such as a solution containing an equimolar amounts of acetic acid and sodium acetate, the solution contains a large number of sodium ions (Na+), acetate ions (CH3COO–) and also a large number of undissociated acetic acid molecules.
CH3COONa (aq) ————-> CH3COO– (aq) + Na+ (aq)
Suppose, a few drops of HCl are added to this buffer solution. This would provide hydrogen (H+) ions. These additional H+ ions would combine with the large reserve of CH3COO– ions to form undissociated acetic acid molecules.
CH3COO– (aq) + H+ (aq) ⇌ CH3COOH
The additional H+ ions are neutralized by CH3COO– ions in the solution, hence there will be no change in its pH value. The reserve basicity of the solution is due to acetate ions.
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Ashish Soni 6 years, 4 months ago
1Thank You