Molar absorptivity measures light absorption by chemical species
Standard units are liters per mole centimeter (L mol-1 cm-1)
Beer-Lambert law states light absorption is proportional to concentration and path length
Equations and Measurements
Absorbance equation: A = ɛ x l x c
Spectrophotometer measures light absorption through substances
Path length measured in centimeters
Absorbance varies with solution concentration and container shape
Calculation Methods
Direct calculation using Beer-Lambert equation: ɛ = A/lc
Line-of-best-fit method: plot concentration vs absorbance, calculate slope
Molar absorptivity remains constant regardless of cuvette length
Data Collection
Measure absorbance at different concentrations of one solution
Plot concentration vs absorbance on line graph
Calculate slope using (Y2-Y1)/(X2-X1) formula
Divide slope by path length to find molar absorptivity
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