HW: 12.9

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Johana Jeon 1A
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Joined: Sun Feb 12, 2017 3:00 am

HW: 12.9

Postby Johana Jeon 1A » Fri Jul 28, 2017 5:52 pm

In 12.9: Which of the following reactions can be classified as reactions between Brosted acids and bases? For those that can be so classified, identify the acid and the base.
a) NH4I(aq) + H2O(l) --> NH3(aq) + H3O(aq) + I-(aq)
b) NH3I(s) --> NH3(g) + HI(g)
c) CH3COOH(aq) + NH3(aq) --> CH3CONH2(aq) + H2O(l)
d) NH4I(am) + KNH2(am) --> KI(am) + 2NH3(l)

Does anyone know how to solve this problem?

Sarah_Wilen
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Joined: Fri Jun 23, 2017 11:39 am
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Re: HW: 12.9

Postby Sarah_Wilen » Fri Jul 28, 2017 9:51 pm

Remember, what is a Bronsted-Lowry acid and base? It is the proton theory transfer fun stuff. According to the bronsted definition, an acid is a species that can transfer a proton. A species that can accept a proton is a base. The proton transfer is the H+ transfer. Now, we assess the equations...

a) NH4I(aq) + H2O(l) --> NH3(aq) + H3O+(aq) + I-(aq)
-Proton is transferred from NH4+ to the H2O, NH4+ is the acid
-H2O accepts the proton, H2O is the base

b) NH4I(s) --> NH3(g) + HI(g)
-Proton is transferred from NH4+ to I-, NH4+ is the acid
-I accepts the proton, I- is the base

c) CH3COOH(aq) + NH3(aq) --> CH3CONH2(aq) + H2O(l)
no proton is transferred here

d) NH4I(am) + KNH2(am) --> KI(am) + 2NH3(l)
-Proton transferred from NH4+ to NH2-, NH4+ is the acid
-NH2- accepts the proton, NH2- is the base

Timothy Kim 1B
Posts: 62
Joined: Fri Sep 29, 2017 7:04 am

Re: HW: 12.9

Postby Timothy Kim 1B » Sun Dec 03, 2017 8:11 pm

For part c, why is there no proton transferred when CH3COOH gains a hydrogen to become CH3CONH2?


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