Charge of permanganate

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Shanzey
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Joined: Wed Sep 18, 2019 12:20 am

Charge of permanganate

Postby Shanzey » Sun Feb 16, 2020 6:47 pm

How do we tell the charge of Mg in MgO4-? Is it because oxygen normally has a charge of -2, and the total compound is -1, thus causing us to determine that Mg has a charge of +7?

PranaviKolla2B
Posts: 114
Joined: Fri Aug 30, 2019 12:17 am

Re: Charge of permanganate

Postby PranaviKolla2B » Sun Feb 16, 2020 6:49 pm

Yes, I believe your latter question demonstrates the correct method.

Brittney Hun 2C
Posts: 104
Joined: Wed Sep 11, 2019 12:15 am

Re: Charge of permanganate

Postby Brittney Hun 2C » Sun Feb 16, 2020 7:33 pm

Yes, since it has a charge of -1 that is the total charge you want to get at the end. Since oxygen has a -2 charge and there are 4 that makes it minus 8 so in order to get a net of -1 the remaining element would have a charge of +7.

Daniel Chen 2L
Posts: 101
Joined: Fri Aug 30, 2019 12:15 am

Re: Charge of permanganate

Postby Daniel Chen 2L » Sun Feb 16, 2020 10:16 pm

In general, you just add the charges up of all the elements in the compound and you should get the total charge.

Keya Jonnalagadda 1A
Posts: 50
Joined: Mon Jun 17, 2019 7:24 am

Re: Charge of permanganate

Postby Keya Jonnalagadda 1A » Sun Feb 16, 2020 10:32 pm

Yes, oxidation rules follow a hierarchy when determining oxidation numbers. For example, the oxidation number of oxygen in compounds is usually -2, which pertains to this question about permanganate. I believe a list of the rules is in our textbook, or online.

Jeremy_Guiman2E
Posts: 82
Joined: Fri Sep 28, 2018 12:29 am

Re: Charge of permanganate

Postby Jeremy_Guiman2E » Sun Feb 16, 2020 10:35 pm

Would we be able to determine Magnesium's charge first? Or is it always easier to start with elements like Oxygen first when determining molecular charges?


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