sashamashapotata
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i have a homework question on the electrolysis of potassium and bromide and it is a 6 marker
I really dont understand it does anyone know what happens at the anode and the cathode and what the electrolyte is? thanks
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username5778034
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electrolysis is using electricity to lysis or break up a compound...

we got to know what solvent is used
and also know the electric charge for K and Br ions so we can deduce at which electrode they are most likely to be attracted to
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rosie110505
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The question should usually tell you the electrolyte, just to check it doesn’t say molten/aqueous? If not then that’s quite a difficult thing for you to work out, if it was aqueous then hydrogen is produced at the cathode (potassium is more reactive than hydrogen, therefore stays in the solution). At the anode, unless the solution is very dilute, bromine should be produced as it is a halide. If the electrolyte is molten KBr, then Potassium is produced at the cathode, and Bromine at the anode.

Cathode:
K+ + e- -> K

Anode:
Br- -> Br + e-

Hope that helps
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scimus63
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try here it might help:
https://www.science-revision.co.uk/electrolysis.html
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sashamashapotata
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(Original post by rosie110505)
The question should usually tell you the electrolyte, just to check it doesn’t say molten/aqueous? If not then that’s quite a difficult thing for you to work out, if it was aqueous then hydrogen is produced at the cathode (potassium is more reactive than hydrogen, therefore stays in the solution). At the anode, unless the solution is very dilute, bromine should be produced as it is a halide. If the electrolyte is molten KBr, then Potassium is produced at the cathode, and Bromine at the anode.

Cathode:
K+ + e- -> K

Anode:
Br- -> Br + e-

Hope that helps
thankyouu
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sashamashapotata
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thank you
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