2006 Final Q8B

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Adriana Muro 1A
Posts: 10
Joined: Fri Jul 22, 2016 3:00 am

2006 Final Q8B

Postby Adriana Muro 1A » Sun Dec 04, 2016 12:48 pm

How are you supposed to know whether the salts pH is above or below 7 by just knowing the compound?

ex)

a. NH4Br

pH is below 7

Ishita_Dubey_2D
Posts: 20
Joined: Wed Sep 21, 2016 3:00 pm

Re: 2006 Final Q8B

Postby Ishita_Dubey_2D » Sun Dec 04, 2016 1:02 pm

On page 159 in the course reader it talks about salts as acids and bases. Certain ions display acidic or basic characteristics after dissolution. In the example you give, NH4Br dissociates into NH4+ and Br- in solution. Because NH4+ is an acid, it lowers the pH of the solution.

Carolyn Huh 1K
Posts: 21
Joined: Wed Sep 21, 2016 2:59 pm

Re: 2006 Final Q8B

Postby Carolyn Huh 1K » Sun Dec 04, 2016 1:07 pm

If you separate the compound, you'll receive NH4+ and Br-. Thus, the chemical equation will come out to be NH4+ + H20 -> NH3 + H3O+. Therefore, since NH4+ is a strong acid, the pH will be below 7, for acids are solutions with pH less than 7.


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