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A voltaic cell operating under standard conditions (1.0 M ion concentrations) utilizes the following reaction: 2...

A voltaic cell operating under standard conditions (1.0 M ion concentrations) utilizes the following reaction:

2 Al(s) + 3 Ni2+(aq) revrxnarrow.gif 2 Al3+(aq) + 3 Ni(s)



What is the effect on the cell emf of each of the following changes?




(a) Water is added to the cathode compartment, diluting the solution.

The positive cell emf rises, becoming more positive.The positive cell emf drops closer to zero.     The negative cell emf rises closer to zero.The negative cell emf drops, becoming more negative.No change in cell emf occurs.




(b) The size of the aluminum electrode is increased.

The positive cell emf rises, becoming more positive.The positive cell emf drops closer to zero.     The negative cell emf rises closer to zero.The negative cell emf drops, becoming more negative.No change in cell emf occurs.




(c) A solution of 1.0 M Al(NO3)3 is added to the anode compartment.

The positive cell emf rises, becoming more positive.The positive cell emf drops closer to zero.     The negative cell emf rises closer to zero.The negative cell emf drops, becoming more negative.No change in cell emf occurs.




(d) Some Na2S is added to the Ni2+ compartment, precipitating some Ni2+ as nickel sulfide.

The positive cell emf rises, becoming more positive.The positive cell emf drops closer to zero.     The negative cell emf rises closer to zero.The negative cell emf drops, becoming more negative.No change in cell emf occurs

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Answer #1

The step by step solution and explanation is provided below. It is done serially as asked in the question.the voltall call equation is → 2Al(s) + 3 NO2+ (aq) = 2 A13+ (aq) + 3 Nics) follows The cell may be represented as All 41 3+and thus the value of positive cell from the equation, we see that dog [NP 2+] becomes less, so the emf drops closer to The cwe know at cathode [Ni247 ENP?/N} = { uitno + o.osal dog at when Nags us added to the cell compartment recipitating Nis, the

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