Question

1. how will the absorbance readings change as the crystal violet is used up? (increase, decrease, no change or impossible to predict without performing the experiment.)
2. why did you answer this way in the previous question?

Explanation:

Absorbance measures how much light a substance absorbs. Crystal violet is a colored compound that absorbs light; as it is used up (concentration decreases), less light will be absorbed by the solution.

Answer:

Decrease