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Jasmin Argueta 1K
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Postby Jasmin Argueta 1K » Thu Dec 06, 2018 11:53 pm

For the compound potassium tetracyanonickelate (II) How do you know how many K's you're suppose to put outside the brackets and why does it go in the beginning rather than end.

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Re: Naming

Postby Niveda_B_3I » Thu Dec 06, 2018 11:58 pm

We know that potassium has a +1 charge, and we know that cyano has a -1 charge and there are 4 cyano so there's a -4 charge but nickelate has a +2 charge so in general the anion has a -2 charge. So there has to be 2 potassium ions so that it is a neutral compound.

Matthew Mar 1J
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Re: Naming

Postby Matthew Mar 1J » Fri Dec 07, 2018 7:53 pm

Also, the potassium comes first because it is the cation. Think of the coordination compound as just a really big, really complicated salt. You could consider NaCl where Na is the cation which always comes before Cl, the anion. In this instance (K2)+2 is the cation and [Ni(CN)4]-2 is the anion (hence the negative charge).

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Re: Naming

Postby MichelleRamirez_2F » Fri Dec 07, 2018 8:28 pm

You have to see what the charge would be on the compound to figure out how many potassium molecules would neitralize that charge.

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