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Postby StephanieDoan3B » Wed Dec 06, 2017 10:33 pm

Which of the following reactions can be classified as reactions between Brønsted acids and bases? For those that can be so classified, identify the acid and the base.

NH4I(s) --> NH3(g) + HI(g)

What makes NH4+ a Bronsted acid? Isn't it NH4I in solid form not aqueous on the left side of the reaction?

Mike Vinci 2B
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Re: 12.9(b)

Postby Mike Vinci 2B » Wed Dec 06, 2017 11:12 pm

Hi Stephanie,
In b. there is a proton transfer from NH4 to I making it NH4+ and I-. In this reaction, NH4+ serves as a acid and I- as a base. NH4I is composed of NH4+ and I-, and can therefore both gain and lose a proton making it both an acid and base, know as being amphoteric. This question doesn't need to be aqueous because no water is present, so it won't break down into NH4+ and I-, but instead since it's solid it decomposes into Nh3 and HI.

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