Recent science articles have discussed how the increase in Carbon Dioxide in our atmosphere is contributing to increased levels of carbon dioxide in the ocean. http://www.whoi.edu/main/topic/ocean-acidification
As CO2 is added to the water, carbonic acid is created. Since CO2 is an odorless, colorless, tasteless gas, it is difficult for students to understand that additional CO2 really does change the chemistry of the water. The experiment we outline here gives all students including those with a visual impairment some concrete evidence that change has occurred!