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On several problems (E9 - Magnesium Sulfate Heptahydrate, F3 - Nitric Acid, as well as many compounds in H), there are ionic compounds with polyatomic ions within them. Do you have any tips to memorizing the charges and elements in these ions? I have flash cards from high school chem, but I was wondering if there are any other ways to recognize these compounds before I take to the flash cards again. Thanks!
I recommend putting them into groups and recognizing the patterns in the prefixes and the charges. Hypochlorite, Chlorite, Chlorate, and Perchlorate all have charges of -1. Polyatomic ions that start with hypo- and end with -ite have one oxygen atom. Polyatomic ions that just end in -ite have 2 oxygen atoms, and so on. I hope this helps.
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