Acid: nm The term acid designates both a substance, a chemical function and a taste sensation.
- Chemistry: For chemists, a substance is acid if, when dissolved in water, it releases hydrogen ions. The degree of acidity is defined by the hydrogen potential (pH), whose scale varies from 0 (very acidic) to 14 (very alkaline); Pure water at 23°C is neutral with a pH of 7.
Some foods contain so-called "weak" organic acids (compared to...
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