Review Topics Use the References to access important values if needed for this q

Question

Review Topics Use the References to access important values if needed for this question. nter electrons as e Use smallest possible integer coefficients. If a box is not needed, leave it blank. Use the table Standard Reduc on Potentials located in the Tables, to predict if a reaction will occur when Co metal is put into a lMaqueous zn" solution. If a reaction will occur, write abalanced net ionic equation for the reaction. If no reaction will occur, leave all boxes blank. 9 more group attempts remaining Retry Entire Group Submit Answer

Explanation / Answer

Question 1.

The potentials:

Co2+ + 2 e Co(s) 0.28

Zn2+ + 2 e Zn(s) 0.7618

Recall that the MOST negative will always oxidize spontaneously

so

Zn will remain as Zn2+, since it can't reduce Co2+

so there is no reaction

Question 2.

Cd2+ + 2 e Cd(s) 0.40

2 H+ + 2 e H2(g) 0.000

Clearly,

the Hydrogen will REDUCE, so Cd metal WILL help H+ to reduce

2H+(aq) + Cd(s) --> Cd2+(aq) + H2(g)

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