red cabbage as a ph indicator
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Red Cabbage as a pH Indicator

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Red Cabbage as a pH Indicator. I N T R O D U C T I O N.

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i n t r o d u c t i o n
I N T R O D U C T I O N

The 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 e p h s c a l e
T H 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 s
M 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
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