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COMEDK2016ChemistryIonic Equilibrium

In a mixture of acetic acid and sodium acetate the ratio of concentrations of the salt to the acid is increased ten times. Then the pH of the solution

Options

  1. Adecreases ten fold
  2. Bincreases ten fold
  3. Cincreases by one
  4. Ddecreases by one

Correct answer

C. increases by one

Step-by-step solution

The pH of buffer solution is given as, pH ₁= p K_ a + [ CH ₃ COONa ] [ CH ₃ COOH ] ...(i) Given, [ CH ₃ COONa ]₂ / [ CH ₃ COOH ]₂=10 [ CH ₃ COONa ] / [ CH ₃ COOH ] pH ₂= pK _ a + 10 [ CH ₃ COONa ] / [ CH ₃ COOH ] pH ₂= pK _ a + [ CH ₃ COONa ] / [ CH ₃ COOH ]+ 10 pH ₂= pH [From Eq. (i) ]

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