How to identify amphiprotic substances (1 Viewer)

[FCB]

Is it common sense?

 

[ibbi00]

Usually you need to prove that a substance is amphiprotic by equations. And what do we know about them? They are able to neutralise both acids and bases. So you would add a hydrogen/hydronium ion to the amphiprotic species and write the product and then do the same with a hydroxide ion, a very popular trial question.

 

[FCB]

Is it only ones that are diprotic or more that can. So things such as carbonic acid cant but hydrogen carbonate can? mirite

 

[UnrealAnchovies]

Is it only ones that are diprotic or more that can. So things such as carbonic acid cant but hydrogen carbonate can? mirite

Correct me if i'm wrong, but aren't these the same things?

 

[UnrealAnchovies]

Also there is a specific syllabus dot-point requiring you to identify where acidic, basic and amphoteric oxides are on the periodic table.

 

[FCB]

Correct me if i'm wrong, but aren't these the same things?

I meant to say hydrogen carbonate ion.

 

[FCB]

Also there is a specific syllabus dot-point requiring you to identify where acidic, basic and amphoteric oxides are on the periodic table.

I want amphiprotic not amphoteric. But yes there is a dot point.

 

[ibbi00]

Well yes they are typically diprotic but can be triprotic. E.g. Phosphoric acid and Citric acid.

 

[UnrealAnchovies]

Just took note of the heading now >.>

 

[khorne]

hydrogen carbonate can be both...(hco3- that is), it can donate the H+ or accept a H+

 

[Amogh]

Like khorne said, just see if the ion (generally is one) can both accept AND donate a proton. Quite obviously a neutral acid molecule of acetic acid will not be amphiprotic. It can only donate a proton and not accept it. Similarly, an acetate ion can only accept a hydronium ion and not donate one. A polyprotic acid (generally) forms amphiprotic ions after it's first complete ionisation. Look a simple indication for the HSC level is to notice a charge and the presence of H. Eg. HCO3-, H2PO4-, HPO4- etc.
A noted exception is H2O which is amphiprotic despite an evident lack of charge.

 

[khorne]

just learn the main ones...sodium hydrogen carbonate, hydrogen carbonate (not the same as carbonic acid, dumb shits) and that's actually it