
(a)
Interpretation:
An expression for the absorbance of a solution containing an indicator has to be calculated.
Concept introduction:
Beer-Lambert’s law states that the intensity of light absorbed by a substance dissolved in a completely transmitting solvent is directly proportional to the concentration of the substance and the path length taken by the light while travelling in the solution.
It is mathematically expressed as,
Where,
(b)
Interpretation:
pKa for this indicator has to be calculated.
Concept introduction:
Beer-Lambert’s law states that the intensity of light absorbed by a substance dissolved in a completely transmitting solvent is directly proportional to the concentration of the substance and the path length taken by the light while travelling in the solution.
It is mathematically expressed as,
Where,

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Chapter 11 Solutions
Quantitative Chemical Analysis
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