In a lab, dissociation constant, K, of an acid-base indicator is measured. A 1.00 x 104 M solution of the indicator buffered at pH 6.00 shows an absorbance of 0.26 at 520 nm in a 1.00-cm cuvette. Given the acidic form of this indicator has a molar absorptivity of 5000 and its basic form has a molar absorptivity of 150O L cm1 mol1, K, is found to be

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