# Chemistry issue

• March 26th 2009, 06:13 PM
TNB
Chemistry issue
(Thinking) Uh, quick question. What would be the correct formula for Cobalt (II) Chlorate? I have Co(ClO3).Why would the parenthesis be used in this situation. In general?

In addition, I'm stuck on the nomenclature for CrPO4. I'm geussing that it's chromium phosfate, but I can't figure out chromium's charge.

And finally, I am studying for a High School (11th grade) test on nomenclature and chemical reactions. Please help, it would be greatly appreciated.(Bow)
• March 26th 2009, 06:21 PM
o_O
We know that cobalt is given as $\text{Co}^{2+}$ and chlorate refers to a group of atoms with an overall negative charge, i.e. $\text{ClO}_3^-$

So we know two chlorates is needed to combine with $\text{Co}^{2+}$ to give a neutral compound: $\text{Co}\left(\text{ClO}_3\right)_2$

As for $\text{CrPO}_4$, the phosphate ion is also polyatomic like chlorate and has an overall charge of -3, i.e. $\text{PO}_4^{3-}$.

Since only one chromium ion is needed to take out the charge, that must mean its ion has a charge of +3. So, the nomenclature for the compound must be chromium (III) phosphate.
• March 28th 2009, 01:23 PM
TNB
Tank You!
Thank you uh, 0_o. I feel a bit dumb now that I look at it. Must've been a bit spaced yesterday.
• March 28th 2009, 01:25 PM
TNB
And the primero espada thing... Is that a Bleach reference, or do you just like being called "first sword"?
• March 28th 2009, 01:26 PM
o_O
Yes, a bleach reference. Go Stark!
• March 28th 2009, 01:42 PM
TNB
Stark?
Stark? Who's Stark?