double salt
Definition
- Noun:
- A solid crystalline compound: A double salt is a solid compound that forms when two different simple salts crystallize together from an aqueous solution. It exists as a single substance with a definite crystal structure, but it dissociates into its constituent ions when dissolved in water.
Usage
- As a noun: The term is used primarily in chemistry to describe specific crystalline compounds formed from two salts.
- Alum is a common double salt used in water purification and dyeing.
- The formation of a double salt depends on the specific conditions of the solution, such as temperature and concentration.
Advanced Usage
- In chemical analysis: The concept is important for understanding the behavior of ions in solution and the purification of substances through crystallization.
- The laboratory procedure involved identifying the double salt that precipitated from the mixed solution.
Variants and Related Words
- Complex salt: A related but distinct term. A complex salt contains a complex ion that does not fully dissociate in solution, whereas a double salt fully dissociates into its simple ions.
- Hydrate: A compound containing water molecules. Some double salts are also hydrates.
Synonyms
- Mixed salt: A less common synonym, though it can sometimes imply a simpler mixture rather than a distinct crystalline compound.
Related Phrases
- To form a double salt: The process by which a double salt crystallizes.
- When potassium sulfate and aluminum sulfate solutions are mixed and evaporated, they form a double salt known as potash alum.
Noun
-
a solution of two simple salts that forms a single substance on crystallization
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