Soda effects BTB when you add it to the BTB. Soda has carbon dioxide in it, which makes it foamy. BTB is used as an indicator of chemicals with a weak acid and base. When you add the carbon dioxide it will change into a green like color.
I think it doesn't depending on how much you put in the water. My class put goldfish in a cup with water and BTB. It had absolutely no effect on the fish.
When we resperate, we release carbon dioxide. Plants take that in to make oxygen. BTB can not do anything with the carbon dioxide. Only if you add a plant in the container with the BTB, you can make it it's blue color again. A fun experiment is to add soda, like coke, to BTB and see if it changes.
BTB indicator can indicate if a substance contains CO2.
It turns yellow after we exhaled into the btb solution..:)
"Base" causes BTB to stay blue.
The BTB stands for: Bromothymol Blue Mostly used for testing the water if there is acid or not.