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Posted: Mon Mar 04, 2019 12:15 am
When do you add Pt to the voltaic cell? Are there some conditions to memorize? Are there some special conditions that we need to remember?
Posted: Mon Mar 04, 2019 12:49 am
You would only put that in your diagram if the question says a platinum electrode is used. You would generally use a platinum electrode when the actual substances you're working with are gases.
Posted: Mon Mar 04, 2019 1:41 am
I noticed in the solutions manual that pt was added when there were 2 aqueous solutions in the anode or cathode. And when there was one gas and one aqueous solution.
Posted: Mon Mar 04, 2019 8:27 am
I agree with the above. Platinum is only used in an electrode when you have nonconducting solids, or aqueous/gaseous substances in one half of your electrochemical cell (that is, in the absence of conducting metal/solid). This is because in every electrochemical cell you need some current conducting metal. Sometimes the metal will play a direct role in the reaction (like Fe or Ag), but in the case that you don't have any of those metals, then you would use a platinum electrode. Also, platinum electrodes are inert, which means they won't interfere with the reaction in any way.
Posted: Mon Mar 04, 2019 10:06 am
You use Pt when you have nonconducting solids! For example, if your cell diagram has two aqueous solutions, or solid that cannot conduct, you would use Pt.
Posted: Mon Mar 04, 2019 12:23 pm
You add Pt(s) when there is not a solid on either the anode or cathode side. Sometimes it will tell you what kind of solid to add in the problem.
Posted: Mon Mar 04, 2019 2:19 pm
Basically, if there is no solid, you add Pt as your cathode or anode because it does not affect the reaction as it is an inert solid.
Posted: Wed Mar 06, 2019 2:33 pm
You add Pt(s) on the left side of the oxidation reaction or the right side of the reduction reaction in the cell diagram when there is no metallic solid in the half reaction. Pt(s) can appear in one, both, or neither half reaction.
Posted: Thu Mar 07, 2019 12:44 am
You add it when there is no solid present or a solid that can't react. It is needed for your cell diagram.
Posted: Thu Mar 07, 2019 11:48 am
If there is no solid present, then you can add in Pt to make the cell diagram.
Posted: Thu Mar 07, 2019 11:52 am
You would only add an inert electrode such as platinum(Pt) when there are no solids present in the reaction.
Posted: Thu Mar 07, 2019 2:50 pm
You would add Pt(s) if there are no solids present on either the anode or cathode side.
Posted: Fri Mar 08, 2019 5:55 pm
You add Pt when there are no conducting solids in the cell diagram. Also, you can use graphite as well but Pt is more common in the textbook.
Posted: Fri Mar 08, 2019 6:10 pm
Platinum is only used when you have an aqueous solution/gaseous solution as your anode/cathode. Therefore, you will only use Pt(s) in you cell diagram if you have a nonconducting solid.
Posted: Fri Mar 08, 2019 7:09 pm
Pt is added when no conducting solids are present.