writing formulas for complex ions?

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for the lab i am about to conduct, i will have to develop a schematic for qualitative analysis. i will be given a mixture that has 4 cations. through a series of steps, i will have to isolate each cation. in an example given in the pre-lab, there is a cation, we'll call "C"...it is in the formula C(OH)2. when i combine it with 6 M NH3, the example shows the resulting complex ion to be C(NH3)4^2+
my question is, how is the formula for this complex ion determined?
 
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