Naphthalene (C10 H2) absorbs around 310 nm in solution. The absorbance of a 1.00 ×10^-3 moldm^-3

step 1 So we are all aware as a Bair Lambert Law equation, A equals E -C -L. So we can write for the mo

Naphthalene (C10 H2) absorbs around 310 nm in solution. The...

Naphthalene $\left(\mathrm{C}_{10} \mathrm{H}_{2}\right)$ absorbs around $310 \mathrm{nm}$ in solution. The absorbance of a $1.00 \times 10^{-3} \mathrm{moldm}^{-3}$ solution is 0.29 in a $1.0 \mathrm{cm}$ cell. Find the molar absorption coefficient. At what concentration will the absorbance be $1.00 ?$ (Section 10.3 )

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Key Concepts

Beer–Lambert Law

This foundational principle in spectroscopy relates the absorbance of a solution to its concentration, the path length of the cell, and the molar absorption coefficient by the formula A = ?cl. It is widely used to determine either the concentration of an absorbing species in a solution or its molar absorption coefficient based on measured absorbance.

Molar Absorption Coefficient

Also known as the molar extinction coefficient, this constant indicates how strongly a substance absorbs light at a specific wavelength. Expressed in units such as L mol?¹ cm?¹, it is a key parameter in analyzing how changes in concentration affect the absorbance of a solution.

Absorbance

Absorbance is a logarithmic measure of the reduction in intensity of light as it passes through a medium containing an absorbing species. It is directly proportional to the concentration of the species and the path length, making it a crucial factor in quantitative spectroscopic analysis.

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