The cells used in absorbance measurements are usuallycalibrated so that the path

Question

The cells used in absorbance measurements are usuallycalibrated so that the pathlength is accurately known and constantfor all measurements. If a student measured the absorbance of astandard solution in a 1.00 cm cell and then mistakenly usedanother call of 1.01 cm pathlength for the measurment of theunknown absorbance, how would this effect the calculatedconcentration of the unknown solution? ((If u don't know the answer, take an educated guess!)) The cells used in absorbance measurements are usuallycalibrated so that the pathlength is accurately known and constantfor all measurements. If a student measured the absorbance of astandard solution in a 1.00 cm cell and then mistakenly usedanother call of 1.01 cm pathlength for the measurment of theunknown absorbance, how would this effect the calculatedconcentration of the unknown solution? ((If u don't know the answer, take an educated guess!))

Explanation / Answer

The new cell would theoretically show a higher absorbance becausethere is a longer pathlength. The longer the pathlength, themore light the cell could absorb. Another conclusion that could be drawn is that the concentration ofthe unknown solution was lower than the concentration of thestandard because the particles in the solution have more area tospread out over due to the increased pathlength. Personally, I would go with the second solution. But you canuse either or both.

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