Fixed volume of 0.1 M benzoic acid solution is added into 0.2 M sodium benzoate solution and formed a 300 m l , resultant acidic buffer solution. If p H of this buffer solution is 4.5 then find added volume of benzoic acid – Given: pK a ben

Question

Fixed volume of 0.1 M benzoic acid solution is added into 0.2 M sodium benzoate solution and formed a 300 m l , resultant acidic buffer solution. If p H of this buffer solution is 4.5 then find added volume of benzoic acid – Given: pK a benzoic acid = 4.2

Quantrex Academy · Accepted Answer

Correct answer: B. 150 m l

p H = p K a + log ⁡ s a l t a c i d 4.5 = 4.2 + log ⁡ s a l t a c i d 0.3 = log ⁡ s a l t a c i d s a l t a c i d = 2 0.3 × 300 - v 0.1 × v = 2 v = 150 m l

Fixed volume of 0.1 M benzoic acid solution is added into 0.2 M sodium benzoate solution and formed a 300 m l , resultant acidic buffer solution. If p H of this buffer solution is 4.5 then find added volume of benzoic acid – Given: pK a benzoic acid = 4.2

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