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platinum electrode help!

ova_stryt

why is platinum included in half cells?

Reply 1

Some1@Havantcol

1

it is needed to measure the standred electrode potential of a half cell, using hydrogen

Reply 2

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

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

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

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

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

qqqwwweee

2

sprite

why is platinum included in half cells?

good electrical conductivity, relatively inert metal

Reply 8

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

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

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

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

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

ova_stryt

OP

thanx everyone. :biggrin:

platinum electrode help!

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