- any of a class of compounds containing chemically combined water. In the case of some hydrates, as washing soda, Na2CO3⋅10H2O, the water is loosely held and is easily lost on heating; in others, as sulfuric acid, SO3⋅H2O, or H2SO4, it is strongly held as water of constitution.
- to combine chemically with water.
- a chemical compound containing water that is chemically combined with a substance and can usually be expelled without changing the constitution of the substance
- a chemical compound that can dissociate reversibly into water and another compound. For example sulphuric acid (H 2 SO 4) dissociates into sulphur trioxide (SO 3) and water (H 2 O)
- a chemical compound, such as a carbohydrate, that contains hydrogen and oxygen atoms in the ratio two to one
- to undergo or cause to undergo treatment or impregnation with water
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