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How to Know the Charge of Ions

Posted: Sun Dec 01, 2019 5:10 pm
by gabbymaraziti
How are we expected to know the charge of ions quickly (SO4 2-, CO3 2-)? Are we going to be given the ligand table shared by Prof. Lavelle on the final?

If not, what is the method for accurately determining the charge of an ion?

Re: How to Know the Charge of Ions

Posted: Sun Dec 01, 2019 5:17 pm
by Gabriella Bates 2L
Unfortunately, the only way to know the charge of a common poly atomic ions, such as SO4 2-, is through memorization. I recommend flashcards. And Lavelle won't give us the ligand table for naming coordination compounds, we have to memorize that as well.

Re: How to Know the Charge of Ions

Posted: Sun Dec 01, 2019 5:22 pm
by Charysa Santos 4G
If you want to calculate the charges using your knowledge of the periodic table and elemental charges that occur from it, you could do that, but it is time consuming and tedious. Like the person above mentioned, it would be in your best interest to just memorize these charges in order to conserve time on the final in the case that a question asks about it.

Re: How to Know the Charge of Ions

Posted: Sun Dec 01, 2019 5:28 pm
by Sally kim 4F
The only way that I know those charges quickly is because I memorized the polyatomic ions. There are lots of ways to memorize the ions, do whatever helps you best memorize. I did it by making them into words. So for example, CO3 2-, in my head it would be cow 2. So like the 3 turns into a "w" and then I just memorize the word with a "2" at the end. I hope that makes sense? It's kind of silly memorizing it that way but that's how I did it in high school.

Re: How to Know the Charge of Ions

Posted: Sun Dec 01, 2019 9:07 pm
by cassidysong 1K
Yeah unfortunately I think we just need to memorize the charges of the common ions

Re: How to Know the Charge of Ions

Posted: Sun Dec 01, 2019 9:08 pm
by Patricia Chan 1C
I think the best way to determine ion charges is just to memorize them :/ it's a bit tedious, but if you just go through some flashcards with them you'll be able to familiarize yourself with them in no time. Hope this helps!

Re: How to Know the Charge of Ions

Posted: Sun Dec 01, 2019 11:24 pm
by stephaniekim2K
You will have to memorize the polyatomic ions, but I'm pretty sure he won't give anything that's too difficult.

Re: How to Know the Charge of Ions

Posted: Sun Dec 01, 2019 11:42 pm
by emaad_3H
You just have to memorize them.