1. Acid - A substance that is sour in taste and lower that seven on the pH scale.
2. Neutralization - when something is in the middle of two sides (like Switzerland:) and that doesn't favor one or the other
3. indicator - a solution that changes color when added to a substance so that you can see where it is on the pH scale
4. corrosive - a substance with an ability to corrode or to "eat" away at a metal
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