Red Cabbage Red Cabbage as a as a

pH Indicator pH Indicator

I N T R O D U C T I O NI N T R O D U C T I O NThe concentration of hydrogen ions is called the pH scale.

Low pH corresponds to high hydrogen ion concentration and vice versa. An acid is a substance that when added to water increases the concentration of hydrogen ions (lowers the pH). A substance that reduces the concentration of hydrogen ions (raises the pH) is called a base.

                          T H ET H Ep H S C A L Ep H S C A L E

 The pH scale measures from pH 1 to pH 14. If a substance has a pH of 1-5, it is an acid. If a substance has a pH of 6-7, it is neutral. And finally, if a substance has a pH of 8-14, it is a base. A pH of 1-3 or 12-14 is considered to be a strong acid or base.

M A T E R I A L SM A T E R I A L S •Two heads of red cabbage

•A blender, chopper, or grater.

•At least 7 beakers (w/ measurements on the side)

•Medicine droppers

•Medicine cups (or small container w/ metric measurements)

•An orange, sparkling water, shampoo, vinegar( optional-you can use vinegar that has been dissolved in distilled water), baking soda, laundry detergent ( preferably powder), aspirin (100mg tablets), red grapes, blueberries, blackberries, carrots, bar soap, red onions,

•An unlimited supply of water

R E D C A B B A G E R E D C A B B A G E C O L O R S C A L EC O L O R S C A L E

R E D C A B B A G E R E D C A B B A G E C O L O R S C A L EC O L O R S C A L E(By: B. Jackson and K. Glenn)(By: B. Jackson and K. Glenn)

O T H E R O T H E R p H I N D I C A T O R Sp H I N D I C A T O R S

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P R O C E D U R E S1. .

B L U E B E R R Y B L U E B E R R Y R E S U L T SR E S U L T S

B L A C K B E R R Y B L A C K B E R R Y R E S U L T SR E S U L T S