Use the References to access important values if needed for this qaestion Enter

Question

Use the References to access important values if needed for this qaestion Enter electrons as e Use smallest possible integer coemicients. If a box is not needed, leave it blank Use the table Standard Reduction Potentials located in the Tables'. to predict if a reaction will occur between ca metal and Br2wt en the two are brought in contact via half-cells in a voltaic cell. If a reaction will occur, write a balanced net ionic equation for the reactioa, assuming that the product ioas are in aqueous solation. If no reaction will occur, leave all boxes blank Submit Answer Retry Entire Group 4 more group attempts remaining

Explanation / Answer

Cd(s) ----> Cd+2(aq) + 2e- Eo = 0.4 V

Br2(l) + 2e- ----> 2Br- (aq) Eo = 1.07 V

The net reaction is

Cd(s) + Br2(l) ----> 2Br-(aq) + Cd+2 (aq)

Eo cell = 0.4 + 1.07 = 1.47 V  

Since Eo is positive , the reaction is feasible (occurs)

Ni(s) ----> Ni+2 (aq) + 2e- Eo = 0.23 V

Cd+2(aq) + 2e- ---> Cd(s) Eo = -0.4 V

Eo cell = -0.4 + 0.23 = -ve

Since Eo cell is getting negative value , the reaction doesnt occur

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