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Using Equation 18-5 and the pKIn value you found, determine the ratio [In-]/[HIn] at the pH...

Using Equation 18-5 and the pKIn value you found, determine the ratio [In-]/[HIn] at the pH in the middle of the range you studied (i.e., pH = 6.0 for bromocresol purple, pH = 7.0 for bromothymol blue, and pH = 7.7 for phenol red). Show how you accomplished this. Draw a conclusion about the relative concentrations of In- and HIn at pH values very close to the pKIn of the indicator.

This is the procedure:

http://www3.chem21labs.com/labfiles/UofC_GL18_Lab.pdf?rf=5204
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