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If we are given the name of a coordination compound, for example, potassium hexacyanidochromate(III), I see that the 'ate' in chromate means a negative complex. But when writing out the formula, since there is a potassium(a cation), does it counter the negative charge of the complex and therefore the formula will not have a negative charge? K3[Cr(CN)6]?
Yes, I think you are exactly correct in that last statement. On their own, the cation and the anionic complex would have their own charges, but since the counter ion (the cation) is acting on the complex, the complex's charge ( in the square brackets) is -3. +3 and -3 cancel out so the whole interaction between the cation and the coordination complex is 0 or neutral.
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