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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`

Text Solution

AI Generated Solution

To solve the problem, we need to determine the concentration ratio of sodium acetate (the conjugate base) to acetic acid (the weak acid) at which the indicator shows a color halfway between its acid and conjugate base forms. ### Step-by-Step Solution: 1. **Understanding the Indicator and its pKa**: - The indicator is a weak acid (let's denote it as HIn) that dissociates into H⁺ and In⁻. - The pK_In of the indicator is given as 5.45. ...
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