So here's what i posted in the past about my experiment https://www.reddit.com/r/forensics/comments/nefrm7/doing_a_lab_experiment_using_luminol/
But when i conducted the practical today the luminol solution turned black after mixing with chlorax bleach (I only have household bleach available), the solution then turned green which I suspected wasn't the product of a reaction, but rather the colour obtained after the two solutions mixed.
Here's how I made my luminol solution:
30ml of 0.2M of copper sulphate as catalyst (changing this concentration as independent variable)
0.1g of luminol
sodium hydroxide + ammonia solution
11g of sodium bicarbonate
all added together to make a 250 ml solution and 50ml is used in each trial to add to the 50ml of diluted bleach solution.
I was unable to fully dissolve the luminol even thought I've tried to increase the pH of the solution. One possible problem with the experiment not working might be that I added too much sodium hydroxide (to a point that the luminol solution turned from light green to bluish green).
Pls give me some advice! Wud appreciate any input, thanks in advance!