M.9

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Cam Bear 2F
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Joined: Thu Jul 27, 2017 3:01 am

M.9

Postby Cam Bear 2F » Thu Oct 05, 2017 5:32 pm

Hi Chemistry friends! For Fundamental M question 9, can someone explain how to set up a net ionic equation? Do you guys think this is something we should know for the test tomorrow?

Simrina Desar Dis 1H
Posts: 49
Joined: Fri Sep 29, 2017 7:04 am

Re: M.9

Postby Simrina Desar Dis 1H » Thu Oct 05, 2017 6:20 pm

No we would not need to know the net ionic equation for this test. However we do need to know how to balance the chemical equation. In this case the balanced equation would be Cu(NO3)2 + 2NaOH --> Cu(OH)2 + 2NaNO3. You would set up the net ionic equation by determining if the molecules are soluble or not. If they are soluble, the ions will dissociate and you will be able to cancel them out on both sides, making the equation more simplified. In this case, after canceling them out, the net ionic would be Cu+2 (aq) + 2OH- (aq) --> Cu(OH)2 (s)

Krupa Prajapati
Posts: 50
Joined: Sat Jul 22, 2017 3:00 am

Re: M.9

Postby Krupa Prajapati » Thu Oct 05, 2017 7:25 pm

To add on to that response, I also think it is important to remember which precipitate is going to form at the end of the reaction. You only include the ions which make up the precipitate as the reactants on the left side, and only include the precipitate on the right side. While it is possible to add the other ions present in the reaction to the equation, this defies the NET ionic equation, which is why we only include the ions necessary to form the precipitate.

Joshua Hughes 1L
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Re: M.9

Postby Joshua Hughes 1L » Thu Oct 05, 2017 11:46 pm

Quick question about these net ionic equation thing. Do we need to write the charges for everything or is that just a little extra thing that the solutions manual does? Like Cu2+ (aq) + 2OH-(aq) ...
Also in regular reactions/equations when would we need to write the charges if ever?
Also in a reaction do we need to ever specify if there are different charges for things like Iron (III) and Iron(II). Do we ever write Fe(III) or something like that in a chemical equation or do we only use those symbols when calling the element by name (ie Iron(III))?

Tasnia Haider 1E
Posts: 55
Joined: Sat Jul 22, 2017 3:01 am

Re: M.9

Postby Tasnia Haider 1E » Fri Oct 06, 2017 1:02 am

Joshua Hughes 3G wrote:Quick question about these net ionic equation thing. Do we need to write the charges for everything or is that just a little extra thing that the solutions manual does? Like Cu2+ (aq) + 2OH-(aq) ...
Also in regular reactions/equations when would we need to write the charges if ever?
Also in a reaction do we need to ever specify if there are different charges for things like Iron (III) and Iron(II). Do we ever write Fe(III) or something like that in a chemical equation or do we only use those symbols when calling the element by name (ie Iron(III))?


Hi, so for the ionic equation you are supposed to have the charges to show the change in state/charge I believe.
I don't think you need to keep the charges in regular equations unless it aids you in figuring out how to write a chemical formula such as knowing what the charges of nitrate are.
You should always know if there are different charges for the iron when you're balancing the equation because the point of the (II) or (III) is to let you know the charge of the iron, so you can balance the equations properly!


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