posted by Bryan .
What is the formula for the ions in the compounds BaSO4 and Li2CO3
BaSO4 has barium ions (Ba2+, Sulfate ions SO42-,
and Lithium carbonate has lithium ions Li1+, and carbonate ions CO32-
Ba ions (might be written as Ba^2+) and sulfate (might be written as SO4^2-).
Li^1- and CO3^2-.
I think the idea behind this question is for the student to realize that the Ba is there as one entity of the ionic bond but the sulfate ion is made up of covalent bonds and it is the other entity. Same kind of thing for the lithium carbonate.