need help with stock naming system?

Question

I cant figure these seven compounds out. can someone do them for me and tell me how you get the answer for some of them

1.CuC2H3o2
2.CaC2o4
3.NaHso4
4.NaHCO3
5.NiBr3
6.Be(NO3)2
7.AuCI3

Answer 1

Guy,

The first step in naming a compound is to decide whether it's an ionic compound, or a molecular compound, because each type has its own naming system. Ionic compounds will always have a metal as the first element, which forms the positive ion, and then a negative ion that is usually composed of a nonmetal or group of nonmetals. Molecular compounds will only contain nonmetals.

Since all 7 formulas that you list happen to have a metal as the first symbol (just find their position on the periodic table if you don't remember for sure), they are all ionic and this is the only naming system that you need to worry about. Luckily, this naming system is easy because you simply 1) name the positive ion (always the metal), and then 2) name the negative ion.

1) The first part is easy... the cation is just the name of the metal. Some metals you can just name and that's it. But others have more than one possible charge (ex: Cu can be +1 or +2), so in order to name the compound unambiguously, you have to put the charge after the name of the metal in roman numerals.

2) Next, name the ion for everything that comes after the metal in the formula. Sometimes it's just one element, and you can use the name of the element with an "-ide" ending, such as "chloride" for Cl. But there are also groups of atoms that form negative ions that have their own special names. For example, the negative ion is #1 is an organic ion called "acetate".

Let's take #5 as an example: The metal is Ni (nickel), but Ni can have two different charges, +2 or +3. So we need to figure out what the charge is. We notice that Br always has a -1 charge in compounds, and since there are 3 of them, the Ni must have a +3 charge to balance them all. So the positive ion is Nickel (III). The negative ion is just one element, bromine, so we can just use the -ide ending and the ion's name is bromide. Thus, the name of this compound is Nickel (III) bromide.

Using this system, the names you want are:

1. Copper (I) acetate
2. Calcium oxalate
3. Sodium bisulfate (Na is always +1, so no need for (I) )
4. Sodium bicarbonate
5. Nickel bromide

I'll let you do the last two on your own to make sure you've got the hang of it. Do them with confidence!!! If you have questions, let me know.

Answer 2

1. Copper(I) acetate
2. Calcium(II) oxalate
3. (Sodium Hydrogen Sulfate, but is that the Stock system)
4. Sodium Hydrogen Carbonate -- ditto above)
5. Nitrogen(III) bromide
6. Be(II) nitrate
7. Gold(III) chloride