Discussion
A solution of molar absorptivity 5000 L/mol\( \cdot \)cm at 2 \( \times \) 10\( ^{-5} \) M in a 1 cm cell gives an absorbance of
Answer: A
Correct answer: 0.10
Applying the Beer-Lambert law,
\[ A = \varepsilon c l = 5000 \times 2 \times 10^{-5} \times 1 = 0.10 \]The units cancel exactly: litres per mole per centimetre, times moles per litre, times centimetres. A molar absorptivity of 5000 is moderately strong, and it means a solution of only twenty micromolar is measurable in an ordinary cell.
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