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

Question

An acid-base indicator, Hln, dissociates according to the following reaction in an aqueous solution. Hln(a q) In [aq) + H^+ [aq) The prorogated form of the Indicator, Hln, has a molar absorptive of 2893 M-1 cm-1 and the deprotonated form, In^-, has a molar absorptive of 19820 M^-1- cm^-1 at 440 nm. The pH of a solution containing a mixture of Hln and In^- , is adjusted to 6.07. The total concentration of Hln and In- is 0.000123 M. The absorbance of this solution was measured at 440 nm In a 1.00 cm curette and was determined to be 0.766. Calculate pKa for Hln. p^k a =

Explanation / Answer

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

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