For homeschool science we tested some acids in a baking soda saturated solution.
First, we made the baking soda solution by adding as much baking soda to a cup of water as would dissolve in it. We added a few drops of an acid and watched the gas bubbles. We charted the strength of the different acids.
One interesting comparison was the strength of the white vinegar next to the apple cider vinegar.
We got the bowl out to test a larger amount of acid (just for fun). It bubbled up out of the jar producing much carbon dioxide.
Since we had our acids out we decided to use the red cabbage indicator. We made a red cabbage indicator with the last of the garden’s red cabbage. I cooked a few large leaves in a 1/2 cup of boiling water until the water became dark. The red cabbage indicator will turn pink in an acid an blue in a base.