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Given the absorbances and concentrations of NO2-, calculate the molar absorbtivity (cm-1?M-1)of this compound. Assume a...

Given the absorbances and concentrations of NO2-, calculate the molar absorbtivity (cm-1?M-1)of this compound. Assume a 1.00 cm path length. ( Hint: Need to construct a Beer's Law Graph)

Concentration (?M) 200 100 50 25 15 10
Absorbance 1.13 0.58 0.31 0.14 0.1 0.05
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Answer #1

We have,

Absorbance = x Concentration x Pathlength

Thus, if a plot of absorbance vs concentration is giving a straight line, the slope of the line will be ( x l).

Here, the plot of absorbance vs concentration can be shown as,

Slope of the straight line from the graph = 0.0056/M

Therefore, Molar absorptivity co-efficient, = 0.0056 cm-1M-1

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