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Topic: why double salts form....??  (Read 3595 times)

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Offline AdiDex

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why double salts form....??
« on: August 26, 2014, 02:29:17 PM »
Why double salts form....??
Which kind of force act between simple compounds to form double salts....??
 ???

Offline Arkcon

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Re: why double salts form....??
« Reply #1 on: August 29, 2014, 06:06:53 AM »
Your question is very general, and unfortunately, very technical.  Lets try to figure this out stepwise:  Can you give us an example of a double salt, and some simpler compounds made of the same elements?
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline AdiDex

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Re: why double salts form....??
« Reply #2 on: August 29, 2014, 02:26:16 PM »
Yep i know some....
Mohr Salt - (NH₄)₂Fe(SO₄)₂·6H₂O
Potash Alum -K2SO4.Al2(SO4)3.24H2O
And another one is Carnalite

Offline Arkcon

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Re: why double salts form....??
« Reply #3 on: August 31, 2014, 11:47:19 AM »
There's a summary, poor though it is, on this page here:  http://en.wikipedia.org/wiki/Double_salt  Briefly, double salts form simply because they can -- the two ions fit in the same crystalline lattice so when present together form the double salt.  Examples have been known for centuries and you may find some insights into what you want to know by looking at specific examples:
http://en.wikipedia.org/wiki/Tutton_salt
http://en.wikipedia.org/wiki/Alum
« Last Edit: September 01, 2014, 10:22:09 AM by Arkcon »
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline AWK

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Re: why double salts form....??
« Reply #4 on: September 01, 2014, 05:02:17 AM »
Double salt in water solution in fact is a physical mixture of ions. As a crystal it is formed because of  good packing which is energetically favorable.
AWK

Offline AdiDex

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Re: why double salts form....??
« Reply #5 on: September 01, 2014, 12:22:49 PM »
That means it is just a rearrangement of ions..
They just rearrange themselves to achieve a more stable lattice..
Is this 100% true.,.???
Or anything else should be added to my statement....??

Offline Borek

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Re: why double salts form....??
« Reply #6 on: September 07, 2014, 12:24:18 PM »
AWK already gave you the best possible answer:

As a crystal it is formed because of  good packing which is energetically favorable.
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Offline AdiDex

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Re: why double salts form....??
« Reply #7 on: September 08, 2014, 03:18:54 AM »
That means it is just a rearrangement of ions..
They just rearrange themselves to achieve a more stable lattice..
Is this 100% true.,.???
Or anything else should be added to my statement....??

Offline Borek

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Re: why double salts form....??
« Reply #8 on: September 08, 2014, 05:23:09 AM »
In the end EVERY chemical reaction can be explained by thermodynamics - either by stability of the products, or by the entropic effects. Creation of the double salts is not different.
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