Question 1

Determine the name and geometrical shape of the ion complex formed in experiment 1. Calculate the ion charge. Explain the rules and steps in naming coordination compounds.

Answer: According to the research we have done, there are two possibilities:
(a) The ion complex formed might be [Co(NH3)3(NO2)3]-
Name: Triamminetrinitrocobalt(II) ion
Geometrical shape: Octahedral
Ion charge: +2+3(-1) = -1
Coordination number: 6
(b) The ion complex formed might be [Co(NH3)5NO2]+
Name: Pentaamminenitrocobalt(II) ion
Geometrical shape: Octahedral
Ion charge: +2+(-1) = +1
Coordination numberL: 6

Rules and steps in naming coordination compounds are:

1. Cation is named before anion.
2. Within complex ion, ligands are named in alphabetical order before the metal ion.
3. Neutral ligands generally have the molecule name, but there are few exception. Anionic ligands drop the -ide and add "o" after the root name.
4. A numerical prefix indicated the number of ligands of a particular type.
5. If complex ion is an anion, we drop the ending of the metal name and add "-ate".

* Remember there is no spaces between the parts of the name.