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What is the systematic name of ammonium bisoxalato cuprate(II)?

I already tried $\ce{(NH4)2[Cu(C2O4)2]^{2+}}$ but i am uncertain if that answer is correct.

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    $\begingroup$ The systematic name of ammonium bisoxalatocuprate(II) is ammonium bisoxalatocuprate(II). Where is your question? $\endgroup$ – Jan Jun 23 '17 at 0:46
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Did you mean to ask "what is the chemical formula of ammonium bisoxalatocuprate(II)", yes? If so, the compound is a salt and should be chargeless. $$\ce{(NH4)2[Cu(C2O4)]}$$ This is because oxalate is -2 charged and there are two of them making a total of -4, copper is +2 charged, and 2 ammoniums make a total of +2 charge. All of these charges cancel.

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