# Does anybody have any ideas about the trend that I found for luminol chemiluminescence reaction? Or can anybody help me analyze them?

The reaction that I did is shown below. I'm testing the duration and luminosity of the light the reaction produces against different pH. The way I used to control the pH is by adding more or less $$\ce{Na2CO3}$$ since it is basic with a pH of 11.

Solution A: In $$\pu{200 ml}$$ water, add in $$\pu{0.16 g}$$ $$\ce{Na2CO3}$$, $$\pu{0.04 g}$$ luminol, $$\pu{5 g}$$ $$\ce{NaHCO3}$$, $$\pu{4.6 g}$$ $$\ce{(NH4)2CO3}$$, and $$\pu{0.08 g}$$ $$\ce{CuSO4}$$. Solution B: In $$\pu{200 ml}$$ water, add in $$\pu{10 ml}$$ $$\ce{H2O2}$$

Then, pouring $$\pu{50 ml}$$ of solution B into $$\pu{50 ml}$$ of solution A, a bright light will be produced. The light will gradually fade away but the light will be produced again after some time, a guaranteed second reaction for every trial. (Could someone also tell me how could this happen?)

The trend that I found is shown below: