Two Copper strips were used to determine the effect of electrolysis time and immersed in 3.080g of Cu (NO3)2 dissolved in 25mL of DI water. The weight of one copper strip act as an anode is taken before the reaction and after the reaction to calculate the change in mass. 1.0A of current and 7.50 V is used throughout the experiment Calculate the theoretical mass that should be obtained at each time interval and Compares the theoretical mass (mg) of copper and the actual mass deposited (obtained from the electrolysis, ∆m) by calculating the %error at different times. Briefly discuss the observed results. Is there any trend observed? Positive Anode (Copper strip): Cu(solid) ®Cu2+(aqueous)+2e- Negative Cathode(Copper strip ): Cu2+(aqueous)+2e- ®Cu(solid) Time interval (min) 2.5 5.0 7.5 10 Initial mass of strip (mg) 3432 3390 3297 3141 Final mass of strip (mg) 3390 3297 3141 2939 Mass change Dm (mg) 44 93 156 202
Two Copper strips were used to determine the effect of
Calculate the theoretical mass that should be obtained at each time interval and Compares the theoretical mass (mg) of copper and the actual mass deposited (obtained from the electrolysis, ∆m) by calculating the %error at different times. Briefly discuss the observed results. Is there any trend observed?
- Positive Anode (Copper strip): Cu(solid) ®Cu2+(aqueous)+2e-
Negative Cathode(Copper strip ): Cu2+(aqueous)+2e- ®Cu(solid)
|
Time interval (min) |
2.5 |
5.0 |
7.5 |
10 |
|
Initial mass of strip (mg) |
3432 |
3390 |
3297 |
3141 |
|
Final mass of strip (mg) |
3390 |
3297 |
3141 |
2939 |
|
Mass change Dm (mg) |
44 |
93 |
156 |
202 |
Michael Faraday Equation:
Q = I x t = nFN
F = Faraday constant (96485 C mol−1)
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