An indicator is a substance which will change colour depending on the pH of the solution it is mixed with. Some indicators are liquids, meaning we can add drops of the indicator to the solution ...

Place an Alka-Seltzer® tablet in indicator solution and have students interpret what the color changes say about the pH of the solution. Explain that Alka-Seltzer® contains powdered acids and a base.

Create your own natural pH indicator using red cabbage and explore acid-base chemistry with this colorful science experiment. Watch as everyday substances transform into a rainbow of colors!

A student exhales through a straw into a solution of tap water and aquarium pH indicator. The changing colour demonstrates that increasing the amount of dissolved carbon dioxide causes water to ...

The composite gels immersed in a pH indicator solution changed color with an applied voltage. As a result, it was revealed that alteration of the pH of composite gels occurred by electro-osmosis ...

Once we have the indicator solution ready we canbegin the experiment. Make sure you have the pH scale eitherprinted out or on a computer (if using a computer, keep it far away from the liquids).