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If a solution of acetonitrile in water whose concentration is 1 x 10-4 mol/dm3 is examined at a wavelength of 224nm, the absorbance is determining to be 30. What's is the molar absorptivity of the absorption band? Assuming the length of the cuvette is 1cm.

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Given, concentration of solution = 1 x 10-4 mol/dm3

absorbance = A = 30

length of cuvette = 1cm

as we know

absorbance A = log\(\frac{I_0}{I}\) = εbc

where

b = length of cuvette

c = concentration of solution

ε = molar absorptivity

A = absorbance

∴ 30 = ε x 1 cm x 1.0 x 10-4 mol/dm3

ε = \(\frac{30}{1\ cm\times\ 1.0\times\ 10^{-4}mol/dm^3}\)

ε = 30 x 104 L mol-1cm-1

or ε = 3.0 x 105 Lmol-1cm-1

Hence, the molar absorptivity (ε) will be 3.0 x 105 Lmol-1cm-1

While the reduction potential of fe (iron) is less than H+ but greater than H20 because at that iron does not corrode in alkaline.

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