double-salt

double salt

noun Chemistry.
a salt that crystallizes as a single substance but ionizes as two distinct salts when dissolved, as carnallite, KMgCl 3 ⋅6H 2 O.

Origin:
1840–50

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World English Dictionary
double salt
 
n
Compare complex salt a solid solution of two simple salts formed by crystallizing a solution of the two salts

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American Heritage
Science Dictionary
double salt  
A salt that crystallizes from an aqueous solution of a mixture of two different ions. The mineral dolomite (CaMg(CO3)2), for example, is a double salt that crystallizes from a solution containing both calcium and magnesium ions. Double salts exist only as solids. Compare complex salt, simple salt.

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