Galvanic Cell HSC 2008 (1 Viewer)

[wkim7]

Galvanic cell under standard conditions
Nickle Anode (Ni(NO3)2) - pale green
Platinum Cathode (Chlorine gas) - (KCl) - colourless
Salt bridge : KNO3

d)Explain any colour changes observed in this cell as the reaction proceeds.

URGENT HELP NEEDED PLEASE

 

[madharris]

Ni(s) --> Ni2+(aq) + 2e-
THis means that the as the green Ni goes into solution, the green will get darker at the anode


I hope that's right...
(I'm not sure how many marks it is, so you might need to put a bit more depending on the marking scheme)

 

[barbernator]

Ni(s) --> Ni2+(aq) + 2e-
THis means that the as the green Ni goes into solution, the green will get darker at the anode


I hope that's right...
(I'm not sure how many marks it is, so you might need to put a bit more depending on the marking scheme)

That's it, nothing else to say.

Edit: actually i guess you could say that after a while some Ni2+ could migrate into the other half cell via the salt bridge making the other cell light green

 

[someth1ng]

Ni(s) --> Ni2+(aq) + 2e-
THis means that the as the green Ni goes into solution, the green will get darker at the anode


I hope that's right...
(I'm not sure how many marks it is, so you might need to put a bit more depending on the marking scheme)

I would say the green electrolyte solution becomes darker as solid nickel moves into solution to become nickel ions.

It's just better to be more specific than "at the anode".