ACID: Produce a piercing pain in a wound, Taste sour, Are red on blue litmus paper (a pH indicator), Have a pH < 7, Common examples: lemons, oranges, vinegar, urine, sulfuric acid, hydrochloric acid, BASE: Give a slippery feel, Are blue on red litmus paper (a pH indicator), Have a pH > 7, Common examples: soap, toothpaste, bleach, cleaning agents, limewater, ammonia water, sodium hydroxide, Taste bitter,

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