The acidity constant for an acid–base indicator was determined by preparing three solutions,each of which has a total indicator concentration of 5.00 ´ 10–5 M. The first solution was madestrongly...

The acidity constant for an acid–base indicator was determined by preparing three solutions,

each of which has a total indicator concentration of 5.00 ´ 10–5 M. The first solution was made

strongly acidic with HCl and has an absorbance of 0.250. The second solution was made strongly

basic and has an absorbance of 1.40. The pH of the third solution was measured at 2.91, with an

absorbance of 0.662. What is the value of Ka for the indicator?

Oct 05, 2022

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