Homework Help: chemistry

Posted by annie on Monday, February 25, 2008 at 4:30am.

Why is;

a) antimony pentafluroide
Sb(-3) + F5(-1) --> SbF4 ?

b) aluminium bromide hexahydrate
Al(-1) + Br(-1) --> AlBr3 . 6H2O ?

The charges don't add up for (b), is there something to do with the "ide"? I don't get it.

And for (a) how did "pentafluoride" end up to be "F4"? --- shouldn't the answer be Sb(F5)3?

chemistry - bobpursley, Monday, February 25, 2008 at 8:08am
Antimony has an electronic structure of
# Ground state electron configuration: [Kr].4d10.5s2.5p3

Which means its valences can be +5, or +3. I dont know of a fluoride SbF4, and suspect one does not exist.

Aluminum has a common valence of +3. Take a look at its electronic structure.

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