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COPY: Spectrophotometric Analysis: Cobalt Chloride Absorption Spectrum

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COPY: Spectrophotometric Analysis: Cobalt Chloride Absorption Spectrum

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Questions and Answers

What is the main principle behind spectrophotometric analysis?

Absorption of electromagnetic radiation

Attenuation of electromagnetic radiation (correct)

Scattering of electromagnetic radiation

Reflection of electromagnetic radiation

How is electromagnetic radiation described?

By referring to its wavelength or frequency (correct)

By its color and shape

By its speed and direction

By its density and pressure

What is the function of a spectrophotometer in measuring absorbance?

Generates electromagnetic power for the sample

Measures the speed of light passing through the sample

Separates light into its component wavelengths and selectively measures the intensity of the light (correct)

Analyzes the color of the sample

What does transmittance measure?

Ratio of the electromagnetic power existing in the sample to that incident on the sample Signup and view all the answers

What is the energy expression for electromagnetic radiation?

$E=h\nu=hc/\lambda$ Signup and view all the answers

Which unit is commonly used to express the attenuation of electromagnetic radiation?

Absorbance (A) Signup and view all the answers

According to Beer Lambert law, what is the absorbance (A) of the sample proportional to?

The molar concentration of the analyte (M) Signup and view all the answers

What is used to correct the result obtained as several phenomena besides the absorbance of the analyte contribute to the final reading?

Blank Signup and view all the answers

What does the absorption spectrum graph plot to determine the maximum wavelength (λ max)?

Absorbance (A) versus wavelength (λ) Signup and view all the answers

What results in a linear relation when a graph of absorbance 'A' versus concentration 'C' is plotted for the standard solution?

Calibration curve or standard curve Signup and view all the answers