basic gchem q - salt hydrolysis

[pidbull]

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How do I hydrolyze these salts?

FeCl3 + H2O....
AlCl3 + H20...

both are supposed to result in acidic solutions, I don't know how to do the reaction.

 

[ucla2134]

How do I hydrolyze these salts?

FeCl3 + H2O....
AlCl3 + H20...

both are supposed to result in acidic solutions, I don't know how to do the reaction.

--> Fe (OH)3 + HCL
--> Al (OH)3 + HCL

 

[pidbull]

--> Fe (OH)3 + HCL
--> Al (OH)3 + HCL

thanks but how did we get 3 OH's or do we assume unlimited H20?

 

[Mamona]

thanks but how did we get 3 OH's or do we assume unlimited H20?

Pidbull use oxidation number that is why OH3, the 3 comes from the Fe...

 

[joonkimdds]

where did other 2 Cl go? r we not supposed to balance them?

 

[GCT]

How do I hydrolyze these salts?

FeCl3 + H2O....
AlCl3 + H20...

both are supposed to result in acidic solutions, I don't know how to do the reaction.

Remember aluminum is amphoteric, the mechanism is a bit unique here, a hydrate with water forms first; you just need to know the oxidation state of the transition metal to know the final metal hydroxide compound.

http://en.wikipedia.org/wiki/Hydrolysis

The chlorine is an ion in the water HCl is not formed. The final products are metal hydrate and hydronium ion .