38. If Experiments 1 and 2 were repeated using a different coloring agent that produces a different color when it binds with NO2-, then which of the following changes in procedure would be necessary?
Your Answer is
Correct Answer is J
Explanation
See the third line of Experiment 1 to form a purple compound that strongly absorbs light of a specific wavelength.
If you change to a new color agent, the liquid produced will be a different color, so you should measure the absorption of light of other wavelengths by the liquid