Give the names and charges of the cation and anion in each of the following compounds: (e) PbCO3
Alright guys, so here we have to write the chemical name and we have to give the charges of each ion in the compound.
So we have PbCO3. Lead is one of our transition metals, so we don't actually know the charge of it so we're going to say it's x. CO3 on the other hand is one of our polyatomic ions and it's a carbonate. Now carbonate originally is CO3 2-, so we know the charge of it, the charge is negative 2. So now we could set up an equation to solve for the charge of lead.
So we have x minus 2 equals the charge of an overall compound, which is 0, because there's no charge here. So when you solve for x you're going to get positive 2. So now we're going to say that lead is positive 2 and cobalt is minus 2.
When you're naming transition metals, remember, based on the charge that's given you have to specify it. So we use Roman numeral numbers, place in parenthesis, to specify the charge. So we have lead, the charge is 2 so we put a Roman numeral 2 in the parenthesis. And your polyatomic ion just keeps the regular name. So it becomes lead (II) carbonate.
Alright guys, hope this helps. See you soon.