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it is needed to measure the standred electrode potential of a half cell, using hydrogen
calumc
If I remember correctly, a platinum electrode is used when the ions are as a gas or NON-METAL ions in solution. For metal ions, the metal is used as the electrode. In both cases the platinum is used to connect to the external circuit.
oh you make me remember the answer
it is used to adsorb (not absorb) hydrogen gas
the electrode is usually coated with platinum black to increase the efficiency of the discharge of hydrogen gas
Platinum electrodes are used when:
1. it's a gas/aqueous ions half cell
eg H2(g)/H+(aq)
2. it's an aqueous ions half cell
eg Fe2+(aq)/Fe3+(aq)
What it is doing in the cell--- source or sink of electrodes
Why we choose platinum--- good conductivity, inert metal
I think that's what my notes say, anyways~
selkie
1. it's a gas/aqueous ions half cell
eg H2(g)/H+(aq)
2. it's an aqueous ions half cell
eg Fe2+(aq)/Fe3+(aq)
What it is doing in the cell--- source or sink of electrodes
Why we choose platinum--- good conductivity, inert metal
I think that's what my notes say, anyways~
selkie
sprite
why is platinum included in half cells?
In the AQA Chemistr Module 5 Jan 03 exam the following question was asked:
When the standard electrode potential for fe2+/fe3+ is measured, a platinum electrode is required. What is the function of the platinum electrode?
Mark scheme answer: To allow transfer of electrons/provide a reaction surface.
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