can someone explain why copper (I) Iodate is CUIO3 rather than CUIO2? I dont get it?

Ignore the copper part…let’s just focus on why IO3(-) is called the iodate ion.

The naming of polyatomic ions is really just something you have to memorize, but at least there are some conventions that make life a bit easier. Since we’re dealing with one now, let’s look at the naming conventions for polyatomic ions that have halogens as their central atom.

Obviously the main part of the ion’s name comes from the central atom. Polyatomic ions with chlorine as the central atom contain the root “chlor-“; those with a central bromine atom contain “brom-“; and so on. The other part(s) of the ion’s name is where it gets confusing.

Generally speaking, the halogen-bearing polyatomic ions can be identified by the oxidation state of their central atom. Here’s how it works.

If the central atom’s oxidation state is +1, the ion is hypo____ite. For example IO(-) would be called hypoiodite.

If the central atom’s oxidation state is +3, the ion is ______ite. IO2(-) is iodite.

If the central atom’s oxidation state is +5, the ion is _______ate. IO3(-) is iodate.

If the central atom’s oxidation state is +7, the ion is per_____ate. IO4(-) is periodate. (IO6(5-) is also called the periodate ion…and the oxidation state of iodine is still +7)

A good trick is to remember how many oxygen atoms are in the “-ate” form of the ion, then subtract one for “-ite” and two for “hypo—ite”.

If the central atom isn’t a halogen, then you’ve got a whole new naming convention. For example SO4(2-) is called “sulfate” (“sulphate” if you’re British), despite the fact that the oxidation state of its central sulfur atom is +6 (and not +5). SO3(2-) would be “sulfite”. NO3(-) is “nitrate” (Nitrogen’s oxidation state is +5) while NO2(-) is “nitrite”.

So like I said, you really just have to learn the names. To answer your question, CuIO3 is copper(I) iodate because the IO3(-) ion is called the iodate ion. CuIO2 would be copper(I) iodite.

Copper I Iodate

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RE:

can someone explain why copper (I) Iodate is CUIO3 rather than CUIO2? I dont get it?

I know iodate is an oxyacid…but how am i suppose to know its 3 and not 2

CuIO3 is copper(I) iodate. Cu(IO2) is copper(I) iodite. This is inorganic nomenclature for Freshmen. Deal with it. Your use of all caps does not help. CuIO is copper(I) hypoiodite. CuIO4 is copper(I) periodate.

Iodate is IO3 with a negative charge.

(Cu^ 1+ ) + (IO3 ^ 1-) = CuIO3