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Slide 1

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Cells and Half Cells…read more

Slide 2

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· An electrochemical cell controls the electron
transfer to produce electrical energy
· A half cell comprises of an element in two
oxidation states
· The electrode potential of the half cell
indicates its tendency to lose or gain electrons…read more

Slide 3

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A copper half cell comprises of a
solution containing Cu² (aq) ions and
a strip or rod of copper metal
Cu² (aq) + 2e Cu (s)
· +2 0
· Reduction
· +2 0
· Oxidation…read more

Slide 4

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Cells from metal/metal ion half cells
· The difference in electrode
potential is measured with a
m · The wire allows electrons to be
ibriu transferred between the half
equil cells
in · The salt bridge allows ions to be
m transferred between the half
· ibriu
Zn · A salt bridge can be made out of
a strip of filter paper soaked in an
· + 2e aqueous solution of an ionic
(s) compound that doesn't react
2 Zn²
· Cu with the half cell solutions
· Usually aqueous KNO (aq) or
+ 2e NHNO (aq) is used…read more

Slide 5

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Non-metal/non-metal ion half cells
· Problem
­ There is no electrode to
connect wire to
· Solution
­ A platinum electrode is
placed in the solution
· The platinum doesn't react
at all
· Its purpose is to allow the
transfer of electrons in and
out of the half cell
· The surface of the platinum
electrode is coated with
2H (aq) + 2e H (g) platinum black…read more

Slide 6

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Metal ion/metal ion half cell
· Fe² (aq) + e Fe³ (aq)
· Cell is made up of:
­ A solution containing Fe² (aq) and
Fe³ (aq) ions of the same
· Also known as Equimolar
­ Inert platinum electrode with a
connecting wire…read more


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