metal aqueous ion reactions

Question 1

colour ppt formed when reacting the metal ions with NaOH (OH- ions) or NH3

Answer 1

Fe (II) - Green
Cu (II) - Blue
Fe (III) - Violet
Al (III)- White

Question 2

which of the metal solutions forms a new colour when NH3 added in Excess, and what is the colour

Answer 2

Cu(II) forms deep blue solution compared to blue before

Question 3

what colour is CuCl4

Answer 3

green

Question 4

what colour is FeCl4

Answer 4

Yellow, no matter if its Fe(II) or Fe(III)

Question 5

what factors determine the acidity of metal aqua ions in aqueous solution

Answer 5

Charge on metal ion
Charge density
ionic radius

Question 6

how and why do those factors effect the acidity

Answer 6

the factors effect how polarised the O-H on the H20 is , how strongly the electrons are pulled determines whether its easier or harder to lose the H+ in H20

Higher charge means stronger pull of electrons= easier to lose H+
higher charge density means stronger pull too

Question 7

why are complexes formed with multidentate ligands more stable than those with monodentate ligands?

Answer 7

due to Chelate effect - Multidentate ligands form more than 1 coordinate bond with the metal ion

when a multidentate ligand replaces a monodentate ligand, the number of particles in solution increases

therefore the chelate complex more stable since its got a higher entropy (disorder)
and more bonds to the metal ion

Question 8

define the chelate effect

Answer 8

enhanced stability of a complex that results when a multidentate ligand forms multiple bonds to a central metal ion through two or more donor atoms.