1.
Tastes sour.
2.
Turns litmus paper blue.
3.
Feels slimey or slippery to the touch.
4.
Reacts with some metals to give off hydrogen gas.
5.
Turns litmus paper red.
http://www.brainpop.com/science/matterandchemistry/acidsandbases/
http://sv.berkeley.edu/showcase/flash/juicebar.html
http://pbskids.org/zoom/games/kitchenchemistry/virtual-start.html
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