confusion name to formula
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confusion name to formula
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]?
Re: confusion name to formula
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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Re: confusion name to formula
You are correct. The overall charge of the compound will be neutral, and so since potassium has a 3+ charge, the overall charge of the complex will be -3, and hence end in "ate"
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Re: confusion name to formula
The "ate" refers to only the anion complex. But the overall charge should always be zero.
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Re: confusion name to formula
It has -ate either because the hexcyanidochromate(III) part, the complex, is negative or because the chromium had just eaten.
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