[Mikez]

I just have 3 questions:

1. How do I name: Sb₂S₃

Do I name this like a covalent bond (di and tri) since Sb has a charge of 3-? or
like a ionic bond since sb is a metal?

2.  CuMnO₄

attempt: copper (II) manganese (IV) oxide - this  doesn't add up and doesn't look right...

3. How do I write the formula for arsenious phosphite? (the main problem is that I have no idea what arsenious is, arsenic only has 1 charge)


EDIT: also do I name O₂ as dioxide or just oxygen?


thanks

[justin122289]

Hmm...don't quote me on the first one, but I'm pretty sure you would use the bi- and tri- prefixes since both are nonmetals.

The second one, CuMnO₄ is Copper (I) Permanganate. MnO₄ is the polyatomic ion with a charge of -1, so Copper must have a charge of -1 to balance that out.

The arsenic one I have no idea.

And finally, the O₂ molecule is usually just referred to as oxygen gas unless it is part of a larger compound.
Hope this helps!

[Borek]

The second one, CuMnO₄ is Copper (I) Permanganate. MnO₄ is the polyatomic ion with a charge of -1, so Copper must have a charge of -1 to balance that out.

Why not copper (II) manganate?

[Dan]

Agreed. Permanganate will oxidise Cu(I).

[justin122289]

Why not copper (II) manganate?

Wouldn't copper (II) permanganate be Cu(MnO₄)₂  ?

[DevaDevil]

permanganate: MnO₄^-
manganate MnO₄^2-

both are in principle possible judging from the formula; but copper(II)manganate is ALOT more stable (as Dan said, permanganate - a strong oxidiser - will oxidise Cu⁺ to Cu²⁺ fast)

[Borek]

This is an interesting case of isomerism

[DevaDevil]

This is an interesting case of isomerism

indeed it is

[justin122289]

permanganate: MnO₄^-
manganate MnO₄^2-

both are in principle possible judging from the formula; but copper(II)manganate is ALOT more stable (as Dan said, permanganate - a strong oxidiser - will oxidise Cu⁺ to Cu²⁺ fast)

Ohh okay I didn't know that MnO₄ had another charge.