What reactions take place at the cathode and the anode when each of the following is electrolyzed? Assume standard conditions.

Question

What reactions take place at the cathode and the anode when each of the following is electrolyzed? Assume standard conditions. (Use the lowest possible coefficients. Omit states-of-matter from your answer.)

I got the cathode for one and the anode for another, but I don't know if I should take into account possible hydrolization? This is what I have so far.  

 (a) 1.0 M CdCl2 solution

cathode: Cd^2+ +2e^- --> Cd

anode: Cl_2 -->2Cl^- +2e^-

For this one the cathode was marked right and the anode was marked wrong.

(b) 1.0 M AlBr3 solution

cathode: Al-->Al^3+ +3e^-

anode: 2Br^- -->Br_2 +2e^-     

For this one the cathode was marked wrong while the anode was marked right 

I'm not sure what I am supposed to do from here as I got part of the questions correct. I don't think I understand how to get the other halves of the questions. Thank you 

Answer 1

Anode for a) looks correct. Cathode for b) should be the reverse reaction.