How do you know the charge of common ions, i.e. nitrate, sulfate, etc?

1 Answer
Jul 11, 2016

Normally, the charge of common ions have to be committed to memory.


Sulfates, carbonates, biphosphates, all have #-2# charges. Halides all have #-1# charges. For metals, the charge derives from the Group number. And of course, the transition metals generally have a #M^(2+)# identity.

All these charges simply have to be learned. There are not that many, and often you are given a clue.