Dr Bob,
Thanks for your help. Ihad googled for 3 hours before asking you. For future reference, if anyone asks this question again, 10th grade chemistry, I found a video on You Tube that makes it easy to understand. It is, The Sci Guys, Ph indicator, acid-base indicator.
Thanks again.
Lulu
2 answers
what question???
My guess is that's the red cabbage indicator question.