Indicators can be used to estimate the pH values of
Chapter 8, Problem 8.87(choose chapter or problem)
Indicators can be used to estimate the pH values of solutions. To determine the pH of a 0.01 M weak acid (HX) solution, a few drops of three different indicators are added to separate portions of 0.01 M HX. The resulting colors of the HX solution are summarized in the last column of the accompanying table. What is the approximate pH of the 0.01 M HX solution? What is the approximate Ka value for HX? Indicator (HIn) Color of HIn Color of In2 pKa of HIn Color of 0.01 M HX Bromphenol Yellow Blue 4.0 Blue blue Bromcresol Yellow Purple 6.0 Yellow purple Bromcresol Yellow Blue 4.8 Green green
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