Write the balanced net-ionic equation for the spontaneous reaction that occurs a
ID: 960664 • Letter: W
Question
Write the balanced net-ionic equation for the spontaneous reaction that occurs as the cell operates, and determine the cell voltage. In which direction do anions flow in the salt bridge as the cell operates? Justify your answer. If 10.0 mL of 3.0-molar AgNO_3 solution is sided to the half-cell on the right, what will happen to the cell voltage? Explain. If 1.0 grain of solid NaCl is added to each half-cell, what will happen to the cell voltage? Explain. If 20.0 mL of distilled water is added to both half-cells, the cell voltage decreases Explain.Explanation / Answer
1) balanced equation for spontaneous reaction
Cd(s)+2Ag+(aq)------> Cd2+(aq)+2Ag(s)
Ag+ /Ag is cathode and Cd2+/Cd is anode
E0cell= E0(cathode) - E0(anode)
= +0.80V - (-0.40V)
= 1.20 V
2) If cell operates more number of Cd(II) ions will be formed
To balance the electrical neutrality anions n salt bridge flow from right to left.
3) cell voltage increases
4) no change in cell voltage
5) E cell = E0 cell + (0.0591/2) log([Ag+]2/[Cd2+])
If we add water then concentrations of both the ions decreases. But in equation there is square root for Concentration of silver ion which is in numerator.
Hence overall value of cell potential decreases.
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