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Estimation of Phosphate Content in Soft Drinks
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Assignments:

 

1. Which of the following statements about the absorbance of a compound in a colorimeter is correct?

 

          a)    The absorbance will double if the concentration of the colored compound is doubled.

          b)    The absorbance will double if the concentration of the colored compound is halved.

          c)    The absorbance does not depend on the concentration of the colored compound.

          d)    The absorbance is highest for light of the same colour as that of the solution.
 

 

 2. Why is it generally preferable to use absorbance as a measure of absorption rather than % Transmittance?

 

          a)    Because %T cannot be measured as accurately as absorbance

          b)    Because %T is dependant on the power of the incident radiation

          c)    Because absorbance is proportional to the concentration of the analyte, whereas %T is not.

 

3. The blank for a colorimeter should be composed of

 

          a)    Water     

          b)    Empty cuvette  

          c)    Test solution

          d)    Everything except the compound of interest which absorbs light

 

4. Using a standard curve, if you know the absorbance of an unknown sample, what else can be determined about the unknown?

 

          a)    The wave length of the maximum absorbance

          b)    The molecular weight of the sample

          c)    The concentration of the sample

          d)    The identity of the sample

 

 

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