If the absorbance of an unknown solution of paracetamol = 0.678, then, it is concentration approximately = 0.0119 mg/L. Transmittance is given as T = I/I₀. If I₀ is the power incid... If the absorbance of an unknown solution of paracetamol = 0.678, then, it is concentration approximately = 0.0119 mg/L. Transmittance is given as T = I/I₀. If I₀ is the power incident on the sample, what does P represent? What is the unit of absorbance which can be derived from Beer Lambert's law?
Understand the Problem
The question involves understanding absorbance in the context of a calibration curve for the concentration of a solution and also addresses a multiple-choice question regarding transmittance and absorbance units derived from Beer Lambert's law.
Answer
P represents the radiant power transmitted. Absorbance has no unit.
The final answer for what P represents is 'Radiant power transmitted by the sample'. The unit for absorbance is 'no unit'.
Answer for screen readers
The final answer for what P represents is 'Radiant power transmitted by the sample'. The unit for absorbance is 'no unit'.
More Information
Transmittance is the ratio of transmitted light to the incident light. Absorbance in the Beer-Lambert law is defined as the logarithm of the reciprocal of transmittance, making it a dimensionless quantity.
Tips
Some might mistakenly assign a unit to absorbance because it involves concentration and path length, which do have units.
Sources
- Beer's Law: Determining the Concentration of a Solution - bellevuecollege.edu
- The Beer-Lambert Law - Chemistry LibreTexts - chem.libretexts.org
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