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], 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



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