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Elements before the brackets

Posted: Tue Dec 02, 2014 5:05 pm
by vsommer
Do you include elements from groups 1 and 2 and their charge when you are figuring out the oxidation? These elements appear before the brackets. Thank you!

Re: Elements before the brackets

Posted: Tue Dec 02, 2014 5:16 pm
by Patrick Chin 1F
Yes, if they come before the brackets, that means they are the cation balancing out the coordinate complex (anion).

Re: Elements before the brackets

Posted: Tue Dec 02, 2014 5:48 pm
by Alexandra Bowling 1K
Can you post an example? I'm not exactly sure what you're talking about.

Re: Elements before the brackets

Posted: Tue Dec 02, 2014 10:12 pm
by Justin Le 2I
An example would be K2[Ni(CN)4]

Here, the K is outside the bracket and serving as a cation, just like in KCl.

Re: Elements before the brackets

Posted: Wed Dec 03, 2014 10:47 am
by GinaYoung1L
It depends. Are you trying to write out the chemical formula? If so, you need to include the cation or anion outside of the brackets. Remember: cations go before the complex (inside the brackets) and anions go after the complex. At the end, the outside ion(s) and the complex need to balance out so the entire coordination compound is electrically neutral. In the coordination compound, you do not write out the charges of the complex or the outside ions.

Example unrelated to coordination compounds: NaCl, you do not write out the individual charges because the Na+ and the Cl- together form an electrically neutral compound.