An acid-base indicator which is a weak acid has a pKIn value = 5.45. At what concentration ratio of sodium acetate to acetic acid would the indicator show a colour half-way between those of its acid and conjugate base forms ?[PKa of acetic acid = 4.75 ]

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4 : 1

6 : 1

5 : 1

3 : 1

answer is C.

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Detailed Solution

PH = PKa + log Salt formacidform→ PH =PKIn = 5.45For a Buffer solutionpH = pKa + log CH3COONaCH3COOH⇒ 5.45 = 4.75 + log CH3COONaCH3COOH0.7 = log CH3COONaCH3COOH ; Antilog 0.7= 5⇒ 51 = log CH3COONaCH3COOH

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