Q 2623212141.     An acid-base indicator which is a weak acid has a `pK_a` 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? `pK_a` of acetic acid `= 4.75. [log 2 = 0.3]`

A

4 : 1

B

7 : 1

C

5 : 1

D

2 : 1

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