Developing Metals
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Describe how you would do a manganate(Vii) titration?
Measure out a quantity of reducing agent-Fe2+ with a pippette and put in conical flask Add sulfuric acid (in excess) Add MnO4- using a burette and swirl flask When turns pink all reducing agent has been used up
What shape are complexes with 4 coordinate bonds and what angles?
Square planar-90 Tetrahedral-109.5
Which electrode does oxidation occur?
Anode(positive)
Which electrode does reduction occur?
Cathode(negative)
In drawings of electrochemical cells which way round should the electrodes be?
Anode on the left and cathode on the right
How do you measure the Ecell?
More positive standard electrode potential- more negative standard electrode potential
How do you make a full reaction equation for a cell?
The more positive half equation goes forward and more negative goes back Must equalise the electrons
Name 3 ways you can prevent rusting?
Painting with a polymer Oiling/greasing Sacrificial metal
State the 4 steps of rusting
Fe reacts with water and oxygen to make Fe2+ and OH- Fe2+ + 2OH- ——-> Fe(OH)2 Reacts with water and oxygen To make Fe(OH)3 Gradually turns into Fe2O3•H20
5 properties I’d transition metals
More than one stable ions Ions have incomplete d orbitals Formation of complexes Formation of coloured ions Ability to act as homogeneous or heterogeneous catalysts
What colour is Fe2+
Pale green
What colour is. Fe3+?
Yellow
What colour is Cu2+?
Blue
What colour is Cu+?
Colourless
Show Fe2+ in water complex
|Fe(H2O)6|2+
Show Fe3+ complex in water
|Fe(H2O)6|3+
Show Cu2+ complex in water
|Cu(H2O)6|2+
Show Cu2+ complex with ammonia
Cu(NH3)4 2+
Show complex of Cu2+ with chlorine
CuCl4 2-
What do you call a ligand with 2 lone pairs?
Bidentate
What is a coordinate bond?
Daitive covalent
What is ethandioate?
A bidentate Ligand
What colour is |Cu(H2O)6|2+?
Blue solution
what colour is Cu(OH)2?
Pale blue precipitate