Definition: Acidulation is the process whereby a substance undergoes a chemical change that produces a more concentrated, less volatile product than the original. This can occur in several ways: 1. Physical reaction: Acids react with bases or other organic compounds to form salts that are not as concentrated as the original. 2. Chemical reaction: Certain acids (such as sulfuric acid) react with metal oxides or non-metallic carbons to produce metals, which are more concentrated than the original. 3. Thermal reaction: Some acids can undergo a thermal change to form solid precipitates, such as hydrogen sulfide, when heated. 4. Mechanical reaction: Acidic substances can be added to other substances through the application of pressure and temperature, producing compounds that are less volatile. The specific term for this process may vary depending on the context, but in general, it refers to a chemical change where one substance undergoes an increase or decrease in concentration compared to its original state.
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