Complex ions

Question 1

Complex ion

Answer 1

A central metal ion surrounded by ligands, linked by co-ordinate bonds

Question 2

Ligand

Answer 2

A molecule or anion which donates a lone pair of electrons to the empty orbitals of a central metal ion forming a co-ordinate or dative covalent bond

Question 3

Co-ordinate bond/dative covalent bond

Answer 3

A shared pair of electrons donated by one atom or ion

Question 4

Co-ordination number

Answer 4

Total number of co-ordinate bonds formed between the ligands and metal ion

Question 5

Lewis Base

Answer 5

A lone pair donor

Question 6

Lewis acid

Answer 6

A lone pair acceptor

Question 7

What is the formula of the complex ion formed of Cu(II) and four chloride ligands

Answer 7

[CuCl4]2-

Question 8

What is the difference between a monodentate, bidentate and multidentate ligand?

Answer 8

Monodentate: the ligand can form one co-ordinate bond

Bidentate: the ligand can form two co-ordinate bonds

Multidentate: the ligand can form many co-ordinate bonds

Question 9

Haemoglobin is a complex ion, what is it used for?

Answer 9

The Fe2+ in it allows O2 to bond and be transported around the body

Question 10

[Pt(NH3)2Cl2] is a complex ion, what is it used for?

Answer 10

Anti cancer drug

Question 11

[Ag(NH3)2]+ is a complex ion, what is it used for?

Answer 11

Makes Tollen’s reagent work as a test to distinguish aldehydes from ketones.

Question 12

[Ag(S2O3)2]3- is a complex ion, what is it used for?

Answer 12

Removing unreacted AgX from photography film.

Question 13

Arrhenius base

Answer 13

An arrhenius base increases the concentration of OH- ions when dissolved