|MadSci Network: Chemistry|
Students were studying the color change of BTB (bromothymol blue) and through their own inquiry experimental designs, some students thought the heat in their own breath made it change. From this hypothesis they developed and experiement where they put one cup of water with BTB in the microwave and one cup of BTB in the fridge. The cup in the micorwave became a lighter blue, and the cup in fridge turned green. Can you help me explain this? The students have learned since that time it is the Co2 in our breath that changes BTB (Bromothymol blue)color. Can you tell us what happened in the micorwave and frige?
Re: What caused BTB to turn green in the refrigerator?
Try the links in the MadSci Library for more information on Chemistry.