Question

What is double salts? explain with example

Answer 1

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Double salts are salts containing more than one cation or anion, and are obtained by combination of two different salts which werecrystallized in the same regular ionic lattice. Examples of double salts include alums (with the general formula MIMIII[SO4]2·12H2O) orTutton's salts (with the general formula [MI]2MII[SO4]2·6H2O).[1] Other examples include potassium sodium tartrate,ammonium iron(II) sulfate (Mohr's salt), thealums, and bromlite. Aluminium sulfacetate,Al
2SO
4(CH
3CO
2)
4, is an example of a double salt with two distinct anions; another is the salt Tl
4(OH)
2CO
3 where hydroxyl-centred triangles of thallium, [Tl
3(OH)]2+
, are a recurring structural motif.[2]

Double salts should not be confused withcomplexes. When dissolved in water, a double salt completely dissociates into simple ions while a complex does not; the complex ionremains unchanged. For example, KCeF4 is a double salt and gives K+, Ce3+ and F− ions when dissolved in water, whereas K4[YbI6] is a complex salt and contains the discrete [YbI6]4− ion which remains intact in aqueous solutions

Answer 2

A double salt is a chemical which contains two different salts held together by a certain number of water molecules.

Example:- Alum------- K2SO4. Al2(SO4)3. 24H2O

Here the first and the second compounds are salts held together by the 24 water molecules.

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