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A salt with associated water of crystallization is known as a hydrate. The structure of hydrates can be quite elaborate, because of the existence of hydrogen bonds that define polymeric structures. [ 3 ] [ 4 ] Historically, the structures of many hydrates were unknown, and the dot in the formula of a hydrate was employed to specify the ...
In contrast to most minerals, which when rehydrated simply form liquid or semi-liquid pastes, or remain powdery, calcined gypsum has an unusual property: when mixed with water at normal (ambient) temperatures, it quickly reverts chemically to the preferred dihydrate form, while physically "setting" to form a rigid and relatively strong gypsum ...
A colorful example is cobalt(II) chloride, which turns from blue to red upon hydration, and can therefore be used as a water indicator.. The notation "hydrated compound⋅n H 2 O", where n is the number of water molecules per formula unit of the salt, is commonly used to show that a salt is hydrated.
In chemistry, a hemihydrate (or semihydrate) is a hydrate whose solid contains one molecule of water of crystallization per two other molecules, or per two unit cells.This is sometimes characterized as a solid that has one "half molecule" of water per unit cell. [1]
structure of solid sodiium molybdate dihydrate. In aqueous solution, sodium molybdate features dissociated sodium ions and tetrahedral molybdate (MoO 4 2- ), which adopts a sulfate -like structure. The solid dihydrate material has a complex structure typical for alkali metal salts of oxyanions.
If the hydration energy is greater than the lattice energy, then the enthalpy of solution is negative (heat is released), otherwise it is positive (heat is absorbed). [3]The hydration energy should not be confused with solvation energy, which is the change in Gibbs free energy (not enthalpy) as solute in the gaseous state is dissolved. [4]
Zinc acetate is a component of some medicines, e.g., lozenges for treating the common cold. [1] Zinc acetate can also be used as a dietary supplement. [2] As an oral daily supplement it is used to inhibit the body's absorption of copper as part of the treatment for Wilson's disease. [3]
The Seven Habits of Highly Effective Teens is a 1998 bestselling self-help book written by Sean Covey, [1] the son of Stephen Covey. [ 2 ] [ 3 ] The book was published on October 9, 1998 through Touchstone Books and is largely based on The Seven Habits of Highly Effective People . [ 4 ]