Silver halides & solubility

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Isabel Bellon 4F
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Joined: Fri Sep 28, 2018 12:27 am

Silver halides & solubility

Postby Isabel Bellon 4F » Tue Nov 20, 2018 2:50 pm

I have in my notes that "increasing covalent character of silver halides makes them less soluble as the size of anion increases." Why is this so and how is it related to polarizability?

Kathryn 1F
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Joined: Fri Sep 28, 2018 12:19 am

Re: Silver halides & solubility

Postby Kathryn 1F » Tue Nov 20, 2018 3:02 pm

so i'm pretty sure the silver halides are a type of salt, because they are ionic compounds. Also, I think the polarizability is how readily an anion will have a distorted electron shell (a higher polarizability means a greater covalent character). So AlF is the most soluble in water because F has the least polarizability compared to Cl, Br, and I. AlI is the least soluble in water because I is the most polarizable. It is really large and has lots of electrons, so the electron cloud will be more pulled towards the Ag cation, giving it a more covalent character.

Ian Marquez 2K
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Re: Silver halides & solubility

Postby Ian Marquez 2K » Wed Nov 21, 2018 1:19 am

Moreover, this is just another example of covalent character within ionic bonds. Ions which cause large distortion, such as AlI, are described as being highly polarizable. This causes the ionic bond to have more covalent bond character.

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