NH4+ and NH3

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Albert Chong_1L
Posts: 77
Joined: Fri Sep 25, 2015 3:00 am

NH4+ and NH3

Postby Albert Chong_1L » Fri Nov 27, 2015 6:45 pm

Hi.

Normally the conjugate acid of a weak base is a strong acid, however, the conjugate acid of the weak base NH3 is a weak acid, NH4+.
Why is this the case?

Andrew Ly 1A
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

Re: NH4+ and NH3

Postby Andrew Ly 1A » Fri Nov 27, 2015 8:30 pm

I believe the general rule is that the stronger the acid/base, the weaker its conjugate base/acid. The weaker the acid/base, the stronger its conjugate base/acid.

However, just because a base is weak does not necessarily mean its conjugate acid is a strong acid that completely dissociates in water. NH3 and NH4+ are weak bases and acids that may be relatively "near the middle" on a scale showing the relative strengths of acids and bases.

Rachel Lipman
Posts: 45
Joined: Fri Sep 25, 2015 3:00 am

Re: NH4+ and NH3

Postby Rachel Lipman » Sat Dec 05, 2015 8:37 pm

It pertains the the conjugate seesaw rule: the stronger the acid, the weaker the conjugate base; the stronger the base, the weaker the conjugate acid.

Ann Zhang_1M
Posts: 25
Joined: Wed Sep 21, 2016 2:59 pm

Re: NH4+ and NH3

Postby Ann Zhang_1M » Wed Nov 23, 2016 10:09 am

In a neutralization reaction, an acid gives away one of its protons (ie H+ ion) to a base and forms its conjugate base, whereas the base accepts the proton and becomes its conjugate acid.


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