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platinum electrode help!

why is platinum included in half cells?
it is needed to measure the standred electrode potential of a half cell, using hydrogen
Reply 2
Avatar for ova_stryt
ova_stryt
OP
i thought it was when the ions in a half cell are in (aq) and so a Pt electrode is needed
Reply 3
Avatar for zazy
zazy
1
sprite
i thought it was when the ions in a half cell are in (aq) and so a Pt electrode is needed

Yes, that's correct.It acts as a medium for the exchange of electrons...a source or sink ...
Reply 4
Avatar for ova_stryt
ova_stryt
OP
zazy
Yes, that's correct.It acts as a medium for the exchange of electrons...a source or sink ...


thats what i thought. but i wrote that on a mock paper and my teacher said it was wrong.
also Some1@Havantcol sed something else :confused:

sory for being a nuisance but i need to know
Reply 5
Avatar for A0307
A0307
7
Some1@Havantcol
it is needed to measure the standred electrode potential of a half cell, using hydrogen


You're thinking of the standard hydrogen electrode, which is used as the reference point to measure other half cells against.
Reply 6
Avatar for ova_stryt
ova_stryt
OP
calumc
You're thinking of the standard hydrogen electrode, which is used as the reference point to measure other half cells against.


does dat mean zazy and me were right.
how come my teacher marked me wrong then
Reply 7
Avatar for qqqwwweee
qqqwwweee
2
sprite
why is platinum included in half cells?


good electrical conductivity, relatively inert metal
Reply 8
Avatar for A0307
A0307
7
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.
Reply 9
Avatar for qqqwwweee
qqqwwweee
2
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
Reply 10
Avatar for kingpong
kingpong
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.


He speaks the truth.
Reply 11
Avatar for selkie222
selkie222
3
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
Reply 12
Avatar for JaF
JaF
1
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.
Reply 13
Avatar for ova_stryt
ova_stryt
OP
thanx everyone. :biggrin:

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