Answer to Question #141778 in General Chemistry for Kayla Kanes

Question

 Describe how electrical resistance readings from a colorimeter/multimeter can be used to explain the relationship between concentration and absorbance.

Answer 1

The colorimeter is based on Beer-Lambert's law, according to which the absorption of light transmitted through the medium is directly proportional to the medium concentration. The device functions based on the level of light received by photocell, which is connected to a digit multimeter yielding resistance readings. Resistance increases with increasing the sample absorption