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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 blueColor of HIn : YellowColor of In- : BluepKa of HIn: 4.0Color of 0.01M HX: Blue
Indicator#2 (HIn): Bromcresol prupleColor of HIn : YellowColor of In- : PurplepKa of HIn: 6.0Color of 0.01M HX: Yellow
Indicator#3 (HIn): Bromcresol greenColor of HIn : YellowColor of In- : BluepKa of HIn: 4.8Color of 0.01M HX: Green
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