QuestionIonic equilibrium / indicators
Consider an acid-base indicator (HIn) as a weak acid which exhibits red colour in non-ionized form and blue colour in ionized form :
HIn ⇌ H⁺ + In⁻
(red) (blue)
What is the general transition range in terms of pH units between the colours of an indicator according to the equation pH = pK_In + log [In⁻]/[HIn], provided that your eyes discern one colour only when it is 10 times as intense as the other ?
- (a) 1
- (b) 2
- (c) 3
- (d) 4
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