The following half cells are prepared: A piece of silver is placed in 1M silver

Question

The following half cells are prepared: A piece of silver is placed in 1M silver nitrate solution and a piece of nickel is placed in 1M nickel(II)nitrate solution. the electrodes are connected to the wires and the cells are connected by a salt bridge of potassium nitrate. the circuit is complete when the switch is closed.

6.) Read each statement below and indicate if its true or false. if its true, explain why its true. if false ,explain how it can be changed to a true statement.

a.) Electrons flow from the nickel electrode to the silver electrode.
b.)The silver electrode increases in mass as the cell operates
c.)Ag+ ions move through the salt bridge to the nickel half cell
d.)Negative ions move through the salt bridge to the silver half cell
e )Ni+2 ions move from the nickel half cell toward the silver half cell

d

Explanation / Answer

a)true

the reduction potential of silver is Eo=0.80V >> the reduction potential of nickel (Eo=-0.25)

So nickel is oxidized giving out electrons to the silver electrode.Ni-->Ni2+ + 2e

b)true

As silver is reduced , the metallic silver generated by reduction og Ag+ ion deposits on the silver electrode and increases its mass

c)false

the salt negative ion from the salt bridge (NO3-) moves into the anode where Ni has been oxidized to Ni by giving up electrons ,and hence excess positive ions are there.This happens to maintain charge balance in the cathode.

d)false

the salt positive ion from the salt bridge (K+) moves into the cathode where Ag+ has been reduced to Ag by taking up electrons ,and hence excess NO3- ,negative ions are there.This happens to maintain charge balance in the cathode.

e)false

only electrons travel from anode to cathode (nickel half cell toward the silver half cell)

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