Colorimetry Overview

What is the primary purpose of using filters in a colorimetry experiment?

Which equation represents Beer-Lambert's law?

How is wave number defined in relation to wavelength?

What does transmittance measure in a colorimetry experiment?

Which of the following correctly defines colorimetry?

In the context of colorimetry, what does the term 'wavelength' refer to?

What can be inferred if the intensity of transmitted light decreases as the concentration of the absorbing substance increases?

What instrument is primarily used to measure the absorbance of a colored solution in colorimetry?

C-Structured Enquiry: Sensor(Colorimetry)

Colorimetry: A method for determining the amount of a substance by measuring the absorbance of a solution containing that substance.
Colorimeter: A device used in colorimetry to measure the amount of light absorbed by a colored solution. Specifically, a photoelectric colorimeter uses a photocell to measure light absorption.
Filters: Substances (thin film, gelatin, or colored glass) used in colorimetry to select specific wavelengths of light.
Wavelength: The distance between successive peaks or troughs of a wave. Measured in nanometers (nm).
Wave Number: The reciprocal of wavelength.
Frequency: The number of waves passing a point per second.
Beer's Law: The intensity of transmitted light decreases exponentially with increasing concentration of the absorbing substance.
Lambert's Law: The intensity of transmitted light decreases exponentially with increasing thickness of the absorbing medium.
Beer-Lambert Law: The absorbance of light is directly proportional to both the concentration of the absorbing substance and the path length of the light through the substance. Mathematically: A = e c t, where A = absorbance, e = molar extinction coefficient, c = concentration, and t = path length.
Calibration Curve: A graph plotting optical density (absorbance) against a series of solutions with known concentrations. This allows for determination of unknown concentrations.
Transmittance: The ratio of transmitted light (I_t) to the initial amount of light (I₀).

Explore the principles and methods of colorimetry, a critical technique used for determining the concentration of substances in solution. This quiz covers key concepts such as Beer's Law, colorimeters, and the effects of filters and wavelength on measurement. Test your understanding of how light interacts with colored solutions.