Assume the molar absorptivity (ε) for CoCl42- at 700 nm is 430.7 M-1 cm-1.?
Assume the molar absorptivity (ε) for CoCl42- at 700 nm is 430.7 M-1 cm-1. If d, the cell path length, is equal to 1.40 cm for the cuvettes being used, and if the measured absorbance (A) at 700 nm is 1.373, what is [CoCl42-]?
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Since
Absorbance = ε (pathlength) (concentration)
1.373 = 430.7 M1- cm-1 (1.40 cm) (concentration)
concentration = 2.28X10^-3 M