# Reaction of an organic acid with aluminium phosphate

1. Apr 15, 2005

### maverick280857

Hi

Does anyone know the reaction of an organic acid (carboxylic acid) with aluminium phosphate ($AlPO_4$)? If yes, please do let me know.

Thanks and cheers
Vivek

2. Apr 15, 2005

### Staff: Mentor

Do you mean any specific reaction, or just acid/base/complexation equilbrium?

In the first case - I know nothing, but my lack of knowledge outperforms my knowdledge :)

In the second case - most carboxylic acids have some complexing ability and they are weak acids, so they will change pH of the solution and they will create some complexes with Al. That, together with the amphoteric Al characteristics, can create quite complex situation in the solution. Not that is simple at the start - Al3+ complexed by OH- and weak phosphoric acid... what a soup :)

Last edited by a moderator: Aug 13, 2013
3. Apr 15, 2005

### maverick280857

Hey Borek

Thanks for the reply. Well, yes I should've been more specific. What happens when you heat an organic (carboxylic) acid with aluminium phosphate at 700 degrees celcius?

Thanks and cheers
Vivek

4. Apr 15, 2005

### Staff: Mentor

I would say no carboxylic acid will survive such heating - regardless of the presence of aluminum phosphate. So basically I would expect you have to deal not with a carboxylic acid, but with the products of decomposition. But I am only guessing here.

Last edited by a moderator: Aug 13, 2013
5. Apr 15, 2005

### movies

Yeah, at that temperature you will probably drive off CO2 from the acid and perhaps end up with alkyl aluminum species plus phosphates.

6. Jun 8, 2005

### maverick280857

Actually it turns out that a ketene intermediate will be formed (according to my teacher).