Amphoteric vs Amphiprotic

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JChen_2I
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Joined: Fri Aug 09, 2019 12:17 am

Amphoteric vs Amphiprotic

Postby JChen_2I » Tue Dec 03, 2019 10:55 pm

Hi,
Is it correct to say that all amphiprotic substances are amphoteric? If so, what are some compounds that are amphoteric but not amphiprotic?

Rodrigo2J
Posts: 102
Joined: Sat Jul 20, 2019 12:16 am

Re: Amphoteric vs Amphiprotic

Postby Rodrigo2J » Tue Dec 03, 2019 11:06 pm

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.

Brynne Burrows 3K
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Joined: Thu Jul 25, 2019 12:16 am

Re: Amphoteric vs Amphiprotic

Postby Brynne Burrows 3K » Tue Dec 03, 2019 11:50 pm

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.

ALegala_2I
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Joined: Thu Jul 11, 2019 12:17 am

Re: Amphoteric vs Amphiprotic

Postby ALegala_2I » Wed Dec 04, 2019 9:57 am

What does the term polyprotic mean? Can a molecule be both polyprotic and amphiprotic?

Rebecca Epner 4A
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Joined: Sat Aug 17, 2019 12:18 am

Re: Amphoteric vs Amphiprotic

Postby Rebecca Epner 4A » Wed Dec 04, 2019 2:33 pm

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?

Deana Moghaddas 3E
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Joined: Fri Aug 30, 2019 12:17 am

Re: Amphoteric vs Amphiprotic

Postby Deana Moghaddas 3E » Wed Dec 04, 2019 2:45 pm

So are amphoteric and amphiprotic the same thing?

JChen_2I
Posts: 107
Joined: Fri Aug 09, 2019 12:17 am

Re: Amphoteric vs Amphiprotic

Postby JChen_2I » Wed Dec 04, 2019 9:28 pm

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

JChen_2I
Posts: 107
Joined: Fri Aug 09, 2019 12:17 am

Re: Amphoteric vs Amphiprotic

Postby JChen_2I » Wed Dec 04, 2019 9:31 pm

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

brennayoung
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Joined: Fri Sep 20, 2019 12:17 am

Re: Amphoteric vs Amphiprotic

Postby brennayoung » Thu Dec 05, 2019 12:13 am

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?

Nuoya Jiang
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Joined: Sat Sep 14, 2019 12:17 am

Re: Amphoteric vs Amphiprotic

Postby Nuoya Jiang » Thu Dec 05, 2019 12:43 pm

polyprotic means an acid can give more than one proton and its conjugate base can accept more than one proton.


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