What is a conjugate acid or base?

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MHarrold_1E
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What is a conjugate acid or base?

Postby MHarrold_1E » Mon Dec 07, 2020 10:35 am

What exactly is a conjugate acid or base? Do all acids have a conjugate base?

Ria Nawathe 1C
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Re: What is a conjugate acid or base?

Postby Ria Nawathe 1C » Mon Dec 07, 2020 10:40 am

A conjugate acid is the resulting species when a base accepts a proton, and a conjugate base is the species that results when an acid gives off a proton.

For example, the conjugate acid of the base NH3 is NH4+, as NH3 + H+ --> NH4+. The conjugate base of H2SO4 is HSO4-, since H2SO4 donating a proton leaves the anion HSO4-.

Hope this helps!

Hannah Alltucker 3L
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Re: What is a conjugate acid or base?

Postby Hannah Alltucker 3L » Mon Dec 07, 2020 10:42 am

A conjugate base is what remains after the acid has given up a proton (So the acid - one H+). A conjugate acid is the base once it has gained that proton (so the base + one H+). Because acid/base reactions also have the ability to go in the reverse direction, I like to think of the conjugates as what would act as the acid and base in a reverse reaction.

Another good thing to remember is that the strength of an acid can be considered as how well that acid remains its conjugate base, a strong base can be considered as how well a base remains its conjugate acid!

All acids and bases will have a conjugate!

Alara Aygen 3K
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Re: What is a conjugate acid or base?

Postby Alara Aygen 3K » Mon Dec 07, 2020 10:43 am

If you are given a base and asked to find the conjugate acid, you need to add one H atom since Bronsted bases are proton acceptors.
If you are given an acid and asked to find the conjugate base, you need to remove one H atom, since the Bronsted acids are proton donors.

jessicasilverstein1F
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Re: What is a conjugate acid or base?

Postby jessicasilverstein1F » Mon Dec 07, 2020 2:16 pm

These can be confusing to me. I think of it like this:
A conjugate acid is the resulting formula when a base accepts a proton (H+), and a conjugate base is the species that results when an acid gives off a proton (H+).

Vanshika Bhushan 1A
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Re: What is a conjugate acid or base?

Postby Vanshika Bhushan 1A » Mon Dec 07, 2020 8:59 pm

A conjugate acid contains one more H atom and one more + charge than the base that formed it. A conjugate base contains one less H atom and one more - charge than the acid that formed it. All acids and bases have conjugate bases.


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