A voltaic cell utilizes the following reaction: Al(s)+3Ag+(aq)Al3+(aq)+3Ag(s) Wh
ID: 978401 • Letter: A
Question
A voltaic cell utilizes the following reaction: Al(s)+3Ag+(aq)Al3+(aq)+3Ag(s) What is the effect on the cell emf of each of the following changes?
A. Water is added to the anode compartment, diluting the solution.
The cell emf will remain the same
B. The size of the aluminum electrode is increased.
The cell emf will remain the same.
C. A solution of AgNO3 is added to the cathode compartment, increasing the quantity of Ag+ but not changing its concentration.
The cell emf will remain the same.
D. HCl is added to the AgNO3 solution, precipitating some of the Ag+ as AgCl.
The cell emf will increase. The cell emf will decrease.The cell emf will remain the same
B. The size of the aluminum electrode is increased.
The cell emf will increase. The cell emf will decrease.The cell emf will remain the same.
C. A solution of AgNO3 is added to the cathode compartment, increasing the quantity of Ag+ but not changing its concentration.
The cell emf will increase. The cell emf will decrease.The cell emf will remain the same.
D. HCl is added to the AgNO3 solution, precipitating some of the Ag+ as AgCl.
The cell emf will increase. The cell emf will decrease. The cell emf will remain the same.Explanation / Answer
For the given cell reaction: Al(s)+3Ag+(aq)Al3+(aq)+3Ag(s)
A. When water is added to anode compartment
The cell emf will increase
B. The size of the aluminum electrode is increased.
The cell emf will increase
D. A solution of AgNO3 is added to the cathode compartment, increasing the quantity of Ag+ but not changing its concentration.
The cell emf will remin the same
E. HCl is added to the AgNO3 solution, precipitating some of the Ag+ as AgCl.
The cell emf will decrease
C.
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