Acids are compounds that ionize (or break down) to yield hydrogen ions (H+) in water. Litmus paper shows that acid is present by turning red. Solutions with pH rated at seven or lower are considered acids.
Give me an example!
Have you ever tasted lemonade that doesn't have enough sugar in it? Remember the bite that it had? That taste is a characteristic of substances that contain acid. However, most acids are highly corrosive (like the stuff inside a car battery), so tasting things to detect acid is not a good idea!
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