Charges on Compounds

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Charges on Compounds

Postby camrynpatterson3C » Sun Nov 26, 2017 10:40 pm

How do we know if a complex has a negative or positive charge? For example, tetracyanonickelate(II) has a formula of [Ni(CN)4]2-. But, how do we know that to write in the formula the 2- charge?

Rachel Formaker 1E
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Re: Charges on Compounds

Postby Rachel Formaker 1E » Sun Nov 26, 2017 10:48 pm

To find the charge of a complex, you add the charges of the atoms/ions that make up the complex.
In tetracyanonickelate(II):
4 x CN- = 4-
1 x Ni2+ = 2+
Charge of complex = 2-
You know that the nickel in this complex has a 2+ charge from the Roman numerals in the name.
Since Table 17.4 is on the outline, I'm assuming that we're supposed to know that CN has a charge of 1-.
Either way, it's good to know because CN- is fairly common.

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