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Questions and Answers
What is the primary purpose of using filters in a colorimetry experiment?
What is the primary purpose of using filters in a colorimetry experiment?
- To select light radiation of a specific wavelength (correct)
- To enhance the color of the solution
- To increase the amount of light transmitted
- To decrease the absorption of the solution
Which equation represents Beer-Lambert's law?
Which equation represents Beer-Lambert's law?
- A = ν / λ
- A = ε c t (correct)
- A = I0 / It
- A = λ c t
How is wave number defined in relation to wavelength?
How is wave number defined in relation to wavelength?
- It is directly proportional to wavelength
- It is half the wavelength
- It is the reciprocal of wavelength (correct)
- It is the average wavelength in a spectrum
What does transmittance measure in a colorimetry experiment?
What does transmittance measure in a colorimetry experiment?
Which of the following correctly defines colorimetry?
Which of the following correctly defines colorimetry?
In the context of colorimetry, what does the term 'wavelength' refer to?
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 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?
What instrument is primarily used to measure the absorbance of a colored solution in colorimetry?
Flashcards
Colorimetry
Colorimetry
A method to figure out the amount of a substance in a solution by measuring how much light is absorbed by the solution.
What is a Photoelectric Colorimeter?
What is a Photoelectric Colorimeter?
An instrument used to measure the amount of light absorbed by a colored solution using a light-sensitive cell.
Why are filters used in Colorimetry?
Why are filters used in Colorimetry?
Filters are made of thin film or glass with a specific color. They are used to select light with a specific wavelength, making the measurement more precise.
What is wavelength?
What is wavelength?
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What is wave number?
What is wave number?
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What is frequency?
What is frequency?
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What is Beer's Law?
What is Beer's Law?
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What is a Calibration Curve?
What is a Calibration Curve?
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Study Notes
C-Structured Enquiry: Sensor(Colorimetry)
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Colorimetry: A method for determining the amount of a substance by measuring the absorbance of a solution containing that substance.
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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.
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Filters: Substances (thin film, gelatin, or colored glass) used in colorimetry to select specific wavelengths of light.
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Wavelength: The distance between successive peaks or troughs of a wave. Measured in nanometers (nm).
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Wave Number: The reciprocal of wavelength.
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Frequency: The number of waves passing a point per second.
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Beer's Law: The intensity of transmitted light decreases exponentially with increasing concentration of the absorbing substance.
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Lambert's Law: The intensity of transmitted light decreases exponentially with increasing thickness of the absorbing medium.
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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.
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Calibration Curve: A graph plotting optical density (absorbance) against a series of solutions with known concentrations. This allows for determination of unknown concentrations.
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Transmittance: The ratio of transmitted light (It) to the initial amount of light (I0).
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