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An acid-base indicator which is a weak a...

An acid-base indicator which is a weak acid has a `pK_(In)` value =5.45. At what concentration ratio of sodium acetate to acctic 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

`6:1`

C

`5:1`

D

`3:1`

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