In chemistry, the pH is the measure of basicality or acidity a substance has. Some people use the pH scale to determine how acidic or basic the substance is. It ranges from 0-14. A pH less than 7 is considered an acid. An example of an acid is soda or lemon juice, which is why there is a picture of soda below. Gases can be considered an acid as well, such as hydrogen chloride. Some common qualities of an acid would be that they can be corrosive and tasting sour.
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