- #1
dopaminergic
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I think I calibrated my pH meter improperly during lab; I got a pH of 4.70, which doesn't make any sense, as KI isn't acidic, as far as I know.
After electrolysis (2I- + 2H2O --> I2 + 2OH- + H2) with a 9V battery, I found a pH of 9.97, which doesn't seem to be correct, either:
(change in [OH-]) = (10^-4.03) - (10^-9.3) = 9.33 * 10^-5M
mol OH- = [OH-] * volume = (9.33 * 10^-5M) * 0.050L = 4.6 * 10^-6 mol
I = Q/t
t = 1800s
Q = (96485C/ mol e-) * (2mol e- / 2mol OH-) * (4.6 * 10^-6 mol OH-)
I = (96485C/ mol e-) * (2mol e- / 2mol OH-) * (4.6 * 10^-6 mol OH-) / 1800s
I = 2.4657 * 10^-4 C/s
I = 2.5 * 10^-4 A
That seems like an absurdly low amperage - have I done anything wrong?
After electrolysis (2I- + 2H2O --> I2 + 2OH- + H2) with a 9V battery, I found a pH of 9.97, which doesn't seem to be correct, either:
(change in [OH-]) = (10^-4.03) - (10^-9.3) = 9.33 * 10^-5M
mol OH- = [OH-] * volume = (9.33 * 10^-5M) * 0.050L = 4.6 * 10^-6 mol
I = Q/t
t = 1800s
Q = (96485C/ mol e-) * (2mol e- / 2mol OH-) * (4.6 * 10^-6 mol OH-)
I = (96485C/ mol e-) * (2mol e- / 2mol OH-) * (4.6 * 10^-6 mol OH-) / 1800s
I = 2.4657 * 10^-4 C/s
I = 2.5 * 10^-4 A
That seems like an absurdly low amperage - have I done anything wrong?