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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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 1500 L cm1 mol1, Ka is found to be
O 2.5 E-6
O 1.1 E-5
O 4.0 E-9
O 3.8 E-7
O 6.2 E-4
Transcribed Image Text: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 1500 L cm1 mol1, Ka is found to be O 2.5 E-6 O 1.1 E-5 O 4.0 E-9 O 3.8 E-7 O 6.2 E-4
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