PbBr2 ==> Pb^2+ + 2Br^- are the ions you have.
Pb^2+ + 2e ==> Pb a the cathode (you can add the states).
2Br^- ==> Br2 + 2e at the anode (again you add the states).
Add the two half equations to obtain the overall equation.
Pb^2+ + 2e ==> Pb a the cathode (you can add the states).
2Br^- ==> Br2 + 2e at the anode (again you add the states).
Add the two half equations to obtain the overall equation.
The molten lead(II) bromide (PbBr2) will be reduced at the cathode electrode (negative electrode) during electrolysis. The half-equation for the reduction reaction is:
Pb2+ + 2e- -> Pb(s)
(ii) At the anode:
The bromide ions (Br-) from the molten lead(II) bromide will be oxidized at the anode electrode (positive electrode) during electrolysis. The half-equation for the oxidation reaction is:
2Br- -> Br2(g) + 2e-
(iii) Overall equation:
When you combine the reduction and oxidation half-equations, you get the overall equation for the electrolysis of molten lead(II) bromide:
PbBr2(l) -> Pb(s) + Br2(g)
Note: (l) indicates liquid state, (s) indicates solid state, and (g) indicates gaseous state.
First, let's break down the compound: lead(II) bromide (PbBr2) consists of Pb2+ cations and Br- anions.
During electrolysis, the positive Pb2+ cations migrate towards the negative electrode (cathode), where reduction occurs. The negative Br- anions migrate towards the positive electrode (anode), where oxidation occurs.
(i) Cathode half-equation:
At the cathode, the Pb2+ cations gain electrons to form solid lead (Pb). The half-equation for the cathode reaction is:
Pb2+ + 2e- -> Pb(s)
(ii) Anode half-equation:
At the anode, the Br- anions lose electrons to form bromine gas (Br2). The half-equation for the anode reaction is:
2Br- -> Br2(g) + 2e-
(iii) Overall equation:
By combining the cathode and anode half-equations, we get the overall equation for the electrolysis of molten lead(II) bromide:
Pb2+ + 2Br- -> Pb(s) + Br2(g)
Note: Please note that in this reaction, molten lead(II) bromide (PbBr2) is used. The state of the reactants and products is indicated as (s) for solid and (g) for gas.