Voltaic cell

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[Patrick Chai Teck Khiong]

I read the ref book Pelangi: When Magnesium rod and copper rod dipped into dilute sulphuric acid, hydrogen ion gains electron because its position is lower than magnesium ion in the ECS.

I wander if copper rod and silver rod is used as electrodes while dilute sulphuric acid used as electrolyte, which ion will be gaining the electrons? Copper(II) ion or Hydrogen ion?

Another question: If Zinc rod and iron rod are used as electrodes while iron(II) sulphate solution used as electrolyte, which ion will be gaining electrons? Iron(II) ion or hydrogen ion?

Any suggestion?

[Patrick Chai Teck Khiong]

I have got the answer for the "copper plate and silver plate dipped into sulphuric acid"
Answer: No reaction happen because copper cannot react with sulphuric acid as displacement cannot occured.

But how bout my second question? I have not yet got the answer..
Any suggestion?

[Wong Hee Ting]

My answer would be H+ ion will gain the electrons

[Patrick Chai Teck Khiong]

Mr. Wong, any clarification for your answer?

[Wong Kee Ping]

bacause the H+ ions has lower position than iron (II) ions

[Patrick Chai Teck Khiong]

Hmm..When zinc rod and iron rod immersed into iron(II) sulphate solution(voltaic cell build up), H+ ion will be discharged as its position is lower than iron(II) ion?
Isnt that displacement reaction will occur between the zinc rod and iron(II) sulphate solution?
Zn + Fe2+ --> Zn2+  +  Fe (Fe2+ will be discharged instead H+)

[Sim Thiam Huat]

hydrogen ion will be discharged at the positive electrode for all the three cells. In the case of Zn/Fe immersed in FeSO₄ solution. At the positive electrode (Fe), H⁺ is dishraged as it is lower than Fe²⁺. At the Zn electrode, Zn will 'dissolve ' into the solution to form Zn²⁺ ion. Yes, Zn may also react with the FeSO₄ solution   to form ZnSO₄. and that is memang displacement but since we are tallking about voltaic cell, I suppose we just concentrate on this aspect in our discussion so that we do not make the matter complicated.
In the 2nd case involving Cu/Ag, there memang is a reaction because any two different metals immersed in an electrolyte will create a potential difference and electron will start flowing and...........

[Patrick Chai Teck Khiong]

Thanks a lot for ur opinion, Mr. Sim.

[Thung Su Ling]

What about zinc and copper immersed in hydrochloric acid?

[Patrick Chai Teck Khiong]

Hydrogen ion is discharged..

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