Discussion
If that solution's absorbance is 0.10 in a 1 cm cell, in a 4 cm cell it would be
Answer: B
Correct answer: 0.40
Absorbance is proportional to path length, so quadrupling the cell length quadruples it:
\[ A = 0.10 \times 4 = 0.40 \]Long-path cells are used exactly this way to bring a weakly absorbing sample into the range where the measurement is most precise, and gas cells with multiple reflections achieve path lengths of many metres by the same principle.
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