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Questions on A2 redox chem!!!

i) A redox reaction occurs between metallic zinc and aqueous copper(II) sulphate.
Write down the two ionic half-equations, one for the oxidation half-reaction and the other for the reduction half-reaction.
Oxidation: Zn ---> Zn^2+ + 2e- ?
Reduction: Cu^2+ + 2e- ---> Cu ?

ii) Combine these so as to give an ionic equation for the overal reaction.

iii) The reaction can be carried out in a beaker, by adding powered zinc to an acqeous solution of copper(II) sulphate. Describe what you would observe when this reaction occurs.

Thanks!
oxidation: zn ----> zn2+ + 2e-
reduction: cu2+ + 2e- -----> cu
overall ionic eqn:
zn + cu^2+ ------> zn^2+ + cu
Reply 2
Avatar for lost_hamster
lost_hamster
OP
Thanks, do u know the answer to iii)?
Reply 3
Avatar for vinny221
vinny221
11
blue to colourless
Reply 4
Avatar for lost_hamster
lost_hamster
OP
Thanks...oh and 2 disadvantages of using a hydrogen electrode and how this can be avoided?

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