The UV-visible spectrum of a solution of a certain compound is shown above - VCE - SSCE Chemistry - Question 3 - 2009 - Paper 1
Question 3
The UV-visible spectrum of a solution of a certain compound is shown above. Consider the following statements about this compound and its UV-visible spectrum.
I Th... show full transcript
Worked Solution & Example Answer:The UV-visible spectrum of a solution of a certain compound is shown above - VCE - SSCE Chemistry - Question 3 - 2009 - Paper 1
Step 1
I The amount of light absorbed by a solution of this compound depends on its concentration.
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Answer
This statement is true as per Beer-Lambert's law, which states that the absorbance of a solution is directly proportional to its concentration.
Step 2
II The amount of light absorbed by a solution of this compound depends on the wavelength of light used.
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This statement is also true. Different wavelengths of light can result in varying absorbance due to the electronic transitions of the compound.
Step 3
III The spectrum is a result of electrons falling back from higher to lower electronic energy levels.
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This statement is true because UV-visible spectroscopy involves electronic transitions which are due to electrons moving between energy levels.
Step 4
IV The concentration of a solution of this compound can only be determined by UV-visible spectroscopy at 250 nm.
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This statement is false. While spectroscopy at specific wavelengths can provide concentration data, it is not limited to just 250 nm; various wavelengths can also be used depending on the compound.
