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3. A solution of the colored substance, which is known to obey the beer lambert law...

3. A solution of the colored substance, which is known to obey the beer lambert law shows 70% transmittance when measured in a 1 cm cell. Calculate the percent transmittance and absorbance of this solution if measured in (a) a 0.5 cm cell and (b) of a solution of twice the original concentration (in 1cm cell).

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Answer #1

in simple understanding, if all the light passes through the solution without absorption, than transmittion is 100% and vice verse. here transmittance is 70%, so 70% of light is passed through solution and 30%is absorb.

1. now as per the law, if pathlength is zero, the transmittance is 100%. hence if pathlengh is 0.5 cm than transmittance is 50% and absorbance is 50%.

2. if concentration of solution increase, the transmittance is decrease and absorbance is increase. hence here in this case, concentration is twice to original concentration, than transmittance is 35% (half of original transmittance) and absorbance is 65%.

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