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Ionic Equilibrum question

2012 · Q110
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Ionic Equilibrum question

2012 · Q110

NEETChemistryIonic EquilibrumMCQ+4 / −1
Buffer solutions have constant acidity and alkalinity because
  1. A
    these give unionised acid or base on reaction with added acid or alkali
  2. B
    acids and alkalies in these solutions are shielded from attack by other ions
  3. C
    they have large excess of H+ or OH−-− ions
  4. D
    they have fixed value of pH
View written solutionFree

Correct answer: A

For this example,

CH3COOH ⇌ CH3COO– + H+ ;

CH3COONa ⇌ CH3COO– + Na+

when few drops of HCl are added to this buffer, the H+ of HCl immediatly combine with CH3COO– ions to form undissociated acetic acid molecules. Thus there will be no H+ ions to combine with CH3COO– ions to form undissociated acetic acid molecules. Thus there will be no appreciable change in its pH value. Like wise if few drops of NaOH are added, the OH– ions will combine with H+ ions to form unionised water molecule. Thus pH of solution will remain constant.

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