colorimetry spectroscopy
Overview
This lesson explores Colorimetry and Spectroscopy, two analytical techniques used to determine the concentration of coloured solutions and identify substances based on their interaction with electromagnetic radiation. We will delve into the principles behind these methods, their applications, and the Beer-Lambert Law.
Introduction to Colorimetry
Colorimetry is a simple and widely used analytical technique, primarily for determining the concentration of coloured solutions. The principle relies on the fact that coloured solutions absorb specific wavelengths of visible light. The more concentrated the solution, the more light it absorbs. A col...
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Key Concepts
- Colorimetry: A quantitative analytical technique used to determine the concentration of a coloured compound in solution by measuring its absorbance of specific wavelengths of visible light.
- Spectroscopy: A broad analytical technique that studies the interaction between matter and electromagnetic radiation to identify substances or determine their concentration.
- Absorbance (A): A measure of the amount of light absorbed by a sample, directly proportional to the concentration of the absorbing species and the path length of the light through the sample.
- Transmittance (T): The fraction of incident light that passes through a sample, related to absorbance by A = -log₁₀(T).
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Exam Tips
- →Clearly state the Beer-Lambert Law (A = εbc) and define each term with correct units. Understand its direct proportionality relationships.
- →Be able to describe the experimental procedure for using a colorimeter, including calibration with a blank, preparation of standard solutions, constructing a calibration curve, and determining unknown concentrations.
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