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Amphoteric vs Amphiprotic

Posted: Tue Dec 03, 2019 10:55 pm
by JChen_2I
Hi,
Is it correct to say that all amphiprotic substances are amphoteric? If so, what are some compounds that are amphoteric but not amphiprotic?

Re: Amphoteric vs Amphiprotic

Posted: Tue Dec 03, 2019 11:06 pm
by Rodrigo2J
Hi! I think the way we have to think about it is that if a substance is amphiprotic then it also has to be amphoteric.

Re: Amphoteric vs Amphiprotic

Posted: Tue Dec 03, 2019 11:50 pm
by Brynne Burrows 3K
Amphiprotic means that a substance can both accept and donate a proton or H+. Amphoteric means that a substance can act as both an acid and a base. All amphoteric substances are amphiprotic because if a molecule can either donate or accept a proton, that means it can act as both an acid or a base. However, ZnO is amphoteric but not amphiprotic because it does not have protons to donate but it can act as an acid or a base.

Re: Amphoteric vs Amphiprotic

Posted: Wed Dec 04, 2019 9:57 am
by ALegala_2I
What does the term polyprotic mean? Can a molecule be both polyprotic and amphiprotic?

Re: Amphoteric vs Amphiprotic

Posted: Wed Dec 04, 2019 2:33 pm
by Rebecca Epner 4A
Brynne Burrows 3K wrote:Amphiprotic means that a substance can both accept and donate a proton or H+. Amphoteric means that a substance can act as both an acid and a base. All amphoteric substances are amphiprotic because if a molecule can either donate or accept a proton, that means it can act as both an acid or a base. However, ZnO is amphoteric but not amphiprotic because it does not have protons to donate but it can act as an acid or a base.

How can ZnO act as an acid if it does not have protons to donate? Is it because it acts as a Lewis acid and can accept electrons?

Re: Amphoteric vs Amphiprotic

Posted: Wed Dec 04, 2019 2:45 pm
by Deana Moghaddas 3E
So are amphoteric and amphiprotic the same thing?

Re: Amphoteric vs Amphiprotic

Posted: Wed Dec 04, 2019 9:28 pm
by JChen_2I
ALegala_3I wrote:What does the term polyprotic mean? Can a molecule be both polyprotic and amphiprotic?

Polyprotic means an acid that can give more than one proton

Re: Amphoteric vs Amphiprotic

Posted: Wed Dec 04, 2019 9:31 pm
by JChen_2I
Rebecca Epner 4A wrote:
Brynne Burrows 3K wrote:Amphiprotic means that a substance can both accept and donate a proton or H+. Amphoteric means that a substance can act as both an acid and a base. All amphoteric substances are amphiprotic because if a molecule can either donate or accept a proton, that means it can act as both an acid or a base. However, ZnO is amphoteric but not amphiprotic because it does not have protons to donate but it can act as an acid or a base.

How can ZnO act as an acid if it does not have protons to donate? Is it because it acts as a Lewis acid and can accept electrons?

I think it can act as an acid in the since that it can react with a base. For example, ZnO + 2NaOH -> Na2ZnO2 + H2O

Re: Amphoteric vs Amphiprotic

Posted: Thu Dec 05, 2019 12:13 am
by brennayoung
JChen_3C wrote:
Rebecca Epner 4A wrote:
Brynne Burrows 3K wrote:Amphiprotic means that a substance can both accept and donate a proton or H+. Amphoteric means that a substance can act as both an acid and a base. All amphoteric substances are amphiprotic because if a molecule can either donate or accept a proton, that means it can act as both an acid or a base. However, ZnO is amphoteric but not amphiprotic because it does not have protons to donate but it can act as an acid or a base.

How can ZnO act as an acid if it does not have protons to donate? Is it because it acts as a Lewis acid and can accept electrons?

I think it can act as an acid in the since that it can react with a base. For example, ZnO + 2NaOH -> Na2ZnO2 + H2O

Sorry Im kind of confused, if it doesn't have protons to donate how does it interact to begin with?

Re: Amphoteric vs Amphiprotic

Posted: Thu Dec 05, 2019 12:43 pm
by Nuoya Jiang
polyprotic means an acid can give more than one proton and its conjugate base can accept more than one proton.