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Indicators can be used to estimate the pH value of soultions. To determine the pH of a 0.01M weak acid (HX), a few drops of three different indicators are added to separate portions of HX. The resulting colors of the HX solution are below.

What is the approximate pH and Ka value of 0.01M HX?

Indicator#1 (HIn): Bromphenol blue
Color of HIn : Yellow
Color of In- : Blue
pKa of HIn: 4.0
Color of 0.01M HX: Blue

Indicator#2 (HIn): Bromcresol pruple
Color of HIn : Yellow
Color of In- : Purple
pKa of HIn: 6.0
Color of 0.01M HX: Yellow

Indicator#3 (HIn): Bromcresol green
Color of HIn : Yellow
Color of In- : Blue
pKa of HIn: 4.8
Color of 0.01M HX: Green

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Category:- Chemistry
Reference No.:- M9461432

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