I'm trying to help my son with a science project on ocean acidification and we're doing a demo using phenol red to show how adding CO2 drops the pH of the water. We have a slide showing the equations and I wanted to add a graphic showing the color scale for pH changes, meaning what's on the comparator that comes with our test kits. I googled like crazy and tried taking a photo, but no luck.
Does anyone have a graphic or can point me to one that I can insert into a Powerpoint file? He really needs a good grade on this!