pH of a buffer solution decreases by 0.02 units when 0.12 g of acetic acid is added to 250 mL of a buffer solution of acetic acid and potassium acetate at 2 7 ∘ C . The buffer capacity of the solution

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pH of a buffer solution decreases by 0.02 units when 0.12 g of acetic acid is added to 250 mL of a buffer solution of acetic acid and potassium acetate at 2 7 ∘ C . The buffer capacity of the solution is

TestHub · Accepted Answer

Buffer capacity, β = d pH ​ d C HA ​ ​ , where, d C HA ​ = no. of moles of acid added per litre d pH ​ d C HA ​ ∴ β ​ = change in pH = volume moles of acetic acid ​ = 250/1000 0.12/60 ​ = 125 1 ​ = 0.02 1/125 ​ = 2.5 1 ​ = 0.4 ​

Chemistry - Ionic Equilibrium Question with Solution | TestHub

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