An acid-base indicator, Hin, dissociates according to the following reaction in

Question

An acid-base indicator, Hin, dissociates according to the following reaction in an aqueous solution. The protonated form of the indicator, Hin, has a molar absorptivity of 2471 M^-1 cm^-1 and the deprotonated form, In^- , has a molar absorptivity of 16930 M^-1 cm^-1 at 440 nm. The pH of a solution containing a mixture of Hin and In^- is adjusted to 5.89 . The total concentration of Hin and In^- is 0.000164 M. The absorbance of this solution was measured at 440 nm in a 1.00 cm cuvette and was determined to be 0.861. Calculate pK_a for Hin.

Explanation / Answer

An acid-base indicator, Hin, dissociates according to the following reaction in

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