Midterm Q4

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Midterm Q4

Postby kennedyp » Sun Mar 15, 2020 6:46 am

(Really sorry if this is in the wrong section!)
When setting up the chemical equation, how do we know that Br- doesn't go in because it doesn't affect the ph? I guess my question is how do we know what affects the ph?

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Re: Midterm Q4

Postby lilymayek_1E » Sun Mar 15, 2020 7:11 am

the reason Br- doesn't need to be included is that it is a spectator ion. spectator ions are ions that do not participate in the reaction and are literally "spectators". if you notice in the question, you'll see that the change is changing on the NH3+ and NH2, and those are the only ions that are participating in the reaction, while Br- would remain unchanged.
in the question, it's presented in the last sentence the Br- isn't really included (at least in the written-out forms of the molecules), so you can assume it doesn't react in this state and it a spectator.

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