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A Level Chemistry Inorganic > Reaction Of Inorganic Bases > Flashcards

Flashcards in Reaction Of Inorganic Bases Deck (19)
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1

What is a Lewis base

It's a proton donor

2

What's a Lewis acid

It's a proton acceptor

3

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

4

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

5

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

6

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

7

What's the colour change when cu 2+ reacts with carbonate

Colour change from pale blue to blue green

8

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

9

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

10

Why do the octahedral complex ions of Fe2+ form a brown colour are

They oxidise with air

11

Give the colour of fe2+ when it undergos reactions with OH,NH3 and carbonate

All of them

Pale green-gelatinous green

12

What's formed when fe2+ reacts with carbonate

Green precipitate

FeCo3

13

What is the colour of precipitate formed when Fe3+ undergoes ligand exchange with Oh and Nh3

Yellow solution to rusty brown precipitate

14

What happens when fe3+ undergoes ligand exchange with carbonate

Rusty precipitate is formed along with bubbles of co2

15

What is meant by amphoteric and give an example of one such element

It can act as both acid and base

Aluminium

16

What is the colour does aluminium form when it reacts with ammonium both in excess and in small amounts

It forms a white precipitate


Of [Al(H20)3 (OH)3

17

What is formed when OH- reacts with aluminium hydroxide in excess

It turns colourless from a white precipitate


Al(Oh)4]-

18

What happens when aluminium reacts with carbonate

A white precipitate and bubbles of Co2

3Co2 and 3H2o

19

What is the role of oH and Nh3 in reactions with inorganic compounds

so they remove protons when they react with complex ions they are also Lewis bases