Chapter 16

Acids and Bases

Target 1:

• I can label similarities and differences in acids and bases.

Acids Bases

Natural Indicators

• Things found in nature which indicate acids vs. bases

Beets

• A very basic solution will change the color of beets or beet juice from red to purple

Curry Powder

• Curry contains the pigment curcumin, which changes from yellow at pH 7.4 to red at pH 8.6.

Geranium Petals

• Geraniums contain the anthocyanin pelargonin, which changes from orange-red in an acidic solution to blue in a basic solution

Grapes

• Red and purple grapes contain multiple anthocyanins. Blue grapes contain a monoglucoside of malvinidin which changes from deep red in an acidic solution to violet in a basic solution.

Which one did we use in our Virtual Lab (Alien Juice Bar?

Red Cabbage!