Question

• Calculate absorbance of a solution which absorbs 90% Ola certain wavelength of light beam passing through a 1 cm cell containing 0.25 M solution ?

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Answer 1

Answer:

The absorbance of the solution is equal to one when 90% light absorbed by the solution.

Explanation:

• Transmittance is the ratio of intensity of transmitted light from the medium to the intensity of the incident light.

        $T =\frac{I}{I_0}$

• Absorbance is defined as negative logarithm of the transmittance.

        A = -log T

Absorbance is also calculated from the formula:

A = εcl

where  ε is the molar absorption coefficient.

c is concentration of the solution,

l is the path length of cell.

Here given, the 90% light absorbed by the solution.

Therefore, transmitted light,  = 100 - 90 = 10%

So, T = 0.1

Absorbance, A = -logT

A = - log (0.1)

A = - (-1)

A = 1

Therefore, the absorbance of a solution which absorbs 90% of certain wavelength of light is equal to one.

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