A voltaic cell utilizes the following reaction: Al(s) + 3Ag+(aq) Al3+(aq) + 3Ag(

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.
(a)The cell emf will increase.
(b)The cell emf will decrease.
(c)The cell emf will remain the same.

B
The size of the aluminum electrode is increased.
(a)The cell emf will increase.
(b)The cell emf will decrease.
(c)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.
(a)The cell emf will increase.
(b)The cell emf will decrease.
(c)The cell emf will remain the same.

D
HCl is added to the AgNO3 solution, precipitating some of the Ag+ as AgCl.
(a)The cell emf will increase.
(b)The cell emf will decrease.
(c)The cell emf will remain the same.

Explanation / Answer

A) (a)The cell emf will increase. because addition of water decreases concentration of aluminum ion. reaction wil shift to the right to make more aluminum ion, therefore emf will increase. B) (c)The cell emf will remain the same. C) (c)The cell emf will remain the same. because no chance in concentration, no effect D) (b)The cell emf will decrease. emf decreases, reaction will shift left which causes a decrease in the value of K which in the nernst equation causes a decrease in overall emf.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.