5.3 - 5.5

Question 1

Back titration

Answer 1

Method where an excess of a reagent is reacted with a sample. The unreacted reagent is then determined by titration.

Question 2

Rf values

Answer 2

Retardation factor, this is calculated using the expression:
Rf = Distance moved by spot
Distance moved by solvent

Question 3

Retention time

Answer 3

The time taken from injection until a component reaches the detector.

Question 4

Transition metal

Answer 4

An element which forms at least one stable ion with a partially filled d-subshell.

Question 5

Complex

Answer 5

A central metal atom or ion with ligands bonded by co-ordinate bonds.

Question 6

Ligand

Answer 6

An ion or molecule with a lone pair of electrons which forms a co-ordinate bond with a central metal atom or ion in a complex.

Question 7

Co-ordination number

Answer 7

The number of co-ordinate bonds to a central metal atom or ion in a complex.

Question 8

Monodentate

Answer 8

A ligand which uses only one lone pair of electrons to form a co-ordinate bond with a central metal atom or ion in a complex.

Question 9

Bidentate

Answer 9

A ligand which uses two lone pairs of electrons to form two co-ordinate bonds with a central metal atom or ion in a complex.

Question 10

Polydentate

Answer 10

A ligand which uses many lone pairs of electrons to form more than two co-ordinate bonds with a central metal atom or ion in a complex.