Question

A CaCO3 solution shows a transmittance of 90% when taken in a cell of 1.9 cm thickness. Calculate it’s concentration, if the molar absorption coefficient is 9000 dm3/mol/cm

Answer 1

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Explanation:

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Answer 2

Given

Transmittance = 90%

cell thickness = 1.9cm

coefficient = 9000 dm3/mol/cm.

Formula to find concentration

c = A / Ɛ * l

where they stand for

c = concentration

Ɛ = molar absorption

l = cell thickness

To find A

A = Ɛ l c

A = 2 - log 10%T

= 2 - log 10 90

= 2 - 1.954

= 0.045

so A = 0.045

And hence

c = A / Ɛ * l

= 0.045 / 9000 * 1.9

= 2.631 * 10^-6 mol/dm3.

Therefore the concentration is 2.631 * 10^-6 mol/dm3.