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Coordination Compounds
Writing Formulas from IUPAC Names
1 question from 1 paper, each with its answer.
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Concepts tested
- Formula from name
All Questions
2002 AIPMT 1 question
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The hypothetical complex chlorodiaquatriamminecobalt (III) chloride can be represented as : -Ligands in the name: chloro (one $Cl^-$), diaqua (two $H_2O$), triammine (three $NH_3$). Total coordination number $= 1 + 2 + 3 = 6$.
Co is in the +3 state. Charge on the complex ion $= +3 + (-1) + 0 + 0 = +2$.
So two $Cl^-$ ions are needed outside the coordination sphere to balance the charge (the word 'chloride' at the end).
Formula: $[CoCl(NH_3)_3(H_2O)_2]Cl_2$