Response of an ion-selective electrode When a fluoride electrode was immersed in standard solutions (maintained at a constant ionic strength of 0.1 M with NaNO3), the following potentials (versus S.C.E) were observed: [F -1 (M) E (mV) 1. Add Sample. 2 Add Stabilizer (TISAB). 3. Stir (steady rate). 4. Insert electrode. 5. Measure. Measurement 1.00 x 10 -5 100.0 1.00 x 10 -4 41.5 Sanple 1.00 х 10 -3 -17.0 Because the ionic strength is constant, the response should depend on the logarithm of the F- concentration. Find [F - ] in an unknown that gave a potential of 0.0 mV.

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Response of an ion-selective electrode
When a fluoride electrode was immersed in standard solutions
(maintained at a constant ionic strength of 0.1 M with NaNO3),
the following potentials (versus S.C.E) were observed:
E (mV)
1. Add Sample.
[F -1 (M)
2. Add Stabilizer
(TISAB).
3. Stir (steady rate).
4. Insert electrode.
5. Measure.
Measurement
1.00 x 10 -5
100.0
1.00 x 10 -4
41.5
1.00 x 10 -3
-17.0
Because the ionic strength is constant, the response should
depend on the logarithm of the F- concentration. Find [F - ] in
an unknown that gave a potential of 0.0 mV.
Prepare the calibration curve in excel, and encode your calculation also. Submit the excel file.
Transcribed Image Text:Response of an ion-selective electrode When a fluoride electrode was immersed in standard solutions (maintained at a constant ionic strength of 0.1 M with NaNO3), the following potentials (versus S.C.E) were observed: E (mV) 1. Add Sample. [F -1 (M) 2. Add Stabilizer (TISAB). 3. Stir (steady rate). 4. Insert electrode. 5. Measure. Measurement 1.00 x 10 -5 100.0 1.00 x 10 -4 41.5 1.00 x 10 -3 -17.0 Because the ionic strength is constant, the response should depend on the logarithm of the F- concentration. Find [F - ] in an unknown that gave a potential of 0.0 mV. Prepare the calibration curve in excel, and encode your calculation also. Submit the excel file.
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