An acid-base indicator which is a weak acid has a \( p K_{a} \) value \( =5.45 \). At what conce...

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An acid-base indicator which is a weak acid has a \( p K_{a} \) 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 ? \( \left[p K_{a}\right. \) of acetic acid \( \left.=4.75\right] \)
(a) \( 4: 1 \)
(b) \( 6: 1 \)
(c) \( 5: 1 \)
(d) \( 3: 1 \)
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