4. A colorimeter (or spectrophotometer) actually measures percent transmittance (%T), as described in the appendix, and...
4. A colorimeter (or spectrophotometer) actually measures percent transmittance (%T), as described in the appendix, and the LabQuest automatically converts that to absorbance. The relationship is logarithmic: Abs = 2 -log(%T) Imagine you have four solutions, and use the LabQuest to measure the absorbance of each one. You then convert to %T as below: Solution Absorbance % Transmittance W 0.250 56.23% 0.750 17.78% 2.250 0.562% Z 2.750 0.178% х Y Consider the sensitivity of the instrument. Do you think all of this data is usable? Why or why not? If it's not all usable, what could you do to the solutions to get a more accurate measurement of their concentrations?