What is the difference between "Hydrate" and "Aqua"

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Yinhan_Liu_1D
Posts: 51
Joined: Sat Sep 24, 2016 3:00 am

What is the difference between "Hydrate" and "Aqua"

Postby Yinhan_Liu_1D » Sat Nov 12, 2016 8:45 pm

Hi,

I understand that aqua is the OH2 which is within the coordination sphere (square brackets) while hydrate is not (it is written last after a dot).

Does any one have an in-depth understanding of the structural or chemical difference between the two structure?

Since they are both neutral and they are both included in one molecule, does the difference exist in how their structure in this molecule?

We know that aqua is donating e- pair and forming bond with the central metal, but how about hydrate? How is it connected to the molecule?

I would really appreciate your help.

Best,

Hannah_Chao_1D
Posts: 25
Joined: Wed Sep 21, 2016 3:00 pm

Re: What is the difference between "Hydrate" and "Aqua"

Postby Hannah_Chao_1D » Sun Nov 13, 2016 1:53 pm

"Aqua" denotes a coordinate covalent bond between water and the central atom in the coordination sphere, while a hydrate is a water molecule outside of the coordination sphere that is attracted to a ion or polar compound via hydrogen bonds.

Yinhan_Liu_1D
Posts: 51
Joined: Sat Sep 24, 2016 3:00 am

Re: What is the difference between "Hydrate" and "Aqua"

Postby Yinhan_Liu_1D » Sun Nov 13, 2016 6:32 pm

Hannah_Chao_1H wrote:"Aqua" denotes a coordinate covalent bond between water and the central atom in the coordination sphere, while a hydrate is a water molecule outside of the coordination sphere that is attracted to a ion or polar compound via hydrogen bonds.


So, you mean that the water molecule is bonded to the molecule via hydrogen bonds? How? Shouldn't the hydrogen not have any extra bonding pair?


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