Data Table 1. Electrochemical cell formation and cell potential values Volume ad
ID: 518671 • Letter: D
Question
Data Table 1. Electrochemical cell formation and cell potential values
Volume added (mL)
Cell potential (V)
Blue Cup
0.10 M CuSO4
50
NONE
White Cup
1.0 M NH3
30
NONE
White Cup
0.10 M CuSO4 (Addition 1)
0.25
0.44
White Cup
0.10 M CuSO4 (Addition 2)
2.25
0.40
1. The calculated Kf value should be different for the two determinations. Yes? No?
Explain why or why not:
Volume added (mL)
Cell potential (V)
Blue Cup
0.10 M CuSO4
50
NONE
White Cup
1.0 M NH3
30
NONE
White Cup
0.10 M CuSO4 (Addition 1)
0.25
0.44
White Cup
0.10 M CuSO4 (Addition 2)
2.25
0.40
Explanation / Answer
1. The calculated Kf values for the two cups would be different as calculated from the experiment. This is because the concentration of NH3 in the blue cup is greater than the one in the white cup which would shuft the equilibrium to the right hand side such that more of complex would be formed, greater Kf value would be thus observed in this case as compared to the white cup.
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