User:Paul Rothenberg/Notebook/CHEM 571 Fall 2014/2014/10/22

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KI Electrode Testing

We continued with making an I- ISE to determine concentration of iodide in solution.

Procedure

  1. Ag/AgCl Electrode:
    1. The plastic covering was removed, and stored in the 3 M NaCl solution
  2. Double-Junction:
    1. Diluted saturated KNO3 was added to the double junction cell
  3. Silver Wire:
    1. A piece was cut and placed in KI/KNO3 solution and electrolyzed
  4. KI Standard Curve:
    1. The Ag/AgCl electrode was placed in the double-junction electrode. The Ag/AgCl electrode was attached to the multimeter
    2. The silver wire was attached directly to the alligator clip
    3. KI solutions were tested for potential


Results

KI Electrode Calibration Curve 10 22.png


[KI], mM ln of KI Potential, mV
50 3.912023005 -278.3
5 1.609437912 -223
0.5 -0.693147181 -161.8
0.05 -2.995732274 -105.1
0.005 -5.298317367 -70