The true absorbance for a 1.0 x 10 −5 M solution is 0.7526. If the percentage stray light for a spectrophotometer is 0.56%, calculate the percentage by which the apparent concentration deviates from the known concentration.

The percentage deviation is  %

Explanation:

From the question we are told that  

     The concentration is of the solution is

     The true absorbance A = 0.7526

      The percentage of transmittance due to stray light %

Generally Absorbance is mathematically represented as

Where T is  the percentage of true transmittance

    Substituting value  

                  %

The Apparent absorbance is mathematically represented

Substituting values

               = 0.7385

The percentage by which apparent absorbance deviates from known absorbance is mathematically evaluated as

             %  

Since Absorbance varies directly with concentration the percentage deviation of the apparent concentration from know concentration  is

              %