Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

A platinum-containing compound, known as Magnus’s green salt, has the formula [Pt(NH3)4][PtCl4] (in which both platinum ions are Pt2+). Name the cation and the anion.

Interpretation Introduction

Interpretation: For the given compound [Pt(NH3)4][PtCl4] the cationic and the anionic species has to be determined.

Concept introduction: The transition metal atoms have tendency to form complex compounds that are linked to the certain neutral or ionic species which leads to the formation of coordination compounds.

Coordination compounds: The compounds having coordination covalent bonds which form when metal ions react with polar molecules or anions.

Ligands: The ions or molecules that forms coordination covalent bond with metal ions in a coordination compound. Ligands should have minimum one lone pair of electron, where it donates two electrons to the metal. Metal atom accepts the electron pair from a ligand forming a coordination bond.

Monodentate Ligand is ligand which donates only one pair of electrons to form bond with metal. It only makes one bond with metal. Polydentate ligand forms two or more coordination bond with metal ions to form a complex.

The strong-field ligands results in pairing of electrons present in the complex and leads to diamagnetic species , while the low-field ligand do not have tendency to pair up the electrons therefore forms paramagnetic species.

The strong field ligands lead to splitting to a higher extent than the weak field ligands and the wavelength of light absorbed depends on the energy gap that is produced by a particular ligand.

Electronic configuration: It is defined as the distribution of electrons present in the atom over orbitals following certain rules like electrons starts filling the lower energy orbital to higher energy, pairing of electrons does not occur until all the orbitals are singly filled and finally no electrons present in orbital can have same set of quantum numbers.

Oxidation number: It is the number that defines the number of electrons that are gained or lost by the chemical substance.

Cation: The positively charged species present in the chemical compound is defined as cation.

Anion: It is the negatively charged species present in the chemical compound.


Using the given condition that both Pt in the given complex has +2 charge the cation and the anion is determined as follows,

The given complex has 4NH3 and 4Cl where the charge of NH3 is 0 since it is classified under neutral ligand whereas the charge of Cl=1 as it is anionic ligand.

[Pt(NH3)4][PtCl4]First consider[Pt(NH3)4]Let x be charge of whole speciesx = 2+(0×4)x = 2

Therefore, the species can be written as [Pt(NH3)4

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