Assignment

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