Reaction Of Inorganic Bases Flashcards
What is a Lewis base
It’s a proton donor
What’s a Lewis acid
It’s a proton acceptor
Why is the acidity of [M(H2O)6]3+ greater of M(H20)6]2+
As they have a higher charge density and are smaller ions )charge/size ratio)this makes it more strongly polarising meaning it weakens O-H bonds
State the colours of cu,fe2+,fe3+ and aluminium hydroxide in their original solution
Cu2+-blue solution
Fe2+-green solution
Fe3+-brown solution
Al-colourless solution
Give the equations of the reaction between cu2+ in little and excess OH- ions
[Cu(H2O6]2+ +2OH- ->CU(H2o)4(OH)2 + 2H2O
[Cu(H2o6)]2+ +3OH- ->Cu(H2o)3 (OH3)3 +3H20
It goes from pale blue to a gelatinous blue precipitate
Give the equation for when Cu2+ reacts with NH3 in both excess and in smaller amounts
State the colour change when it reacts with Nh3 in excess
[Cu(H2O)6]2+ +2Nh3 ->[cu(oh)2 (H20)4] +2NH4+
Pale blue to gelatinous blue ppt
[Cu(H20)6]2+ +4NH3 -> [Cu(NH3)4(H20)2
PAle blue to dark/royal blue
What’s the colour change when cu 2+ reacts with carbonate
Colour change from pale blue to blue green
What’s the colour change when Cu hydroxide reacts with chloride ions and give the shape of the molecule
It goes from a blue colour to a yellow green colour
The shape of the molecular is tetrahedral
How do we distinguish between both fe2+ and Fe3+ complex ions with H20 and give the colour change
React with Naoh and they form their respective colours
Fe2+-> pale green
Fe3+->yellow/purple,brown
Why do the octahedral complex ions of Fe2+ form a brown colour are
They oxidise with air
Give the colour of fe2+ when it undergos reactions with OH,NH3 and carbonate
All of them
Pale green-gelatinous green
What’s formed when fe2+ reacts with carbonate
Green precipitate
FeCo3
What is the colour of precipitate formed when Fe3+ undergoes ligand exchange with Oh and Nh3
Yellow solution to rusty brown precipitate
What happens when fe3+ undergoes ligand exchange with carbonate
Rusty precipitate is formed along with bubbles of co2
What is meant by amphoteric and give an example of one such element
It can act as both acid and base
Aluminium
