How does the Fluoride Ion-Selective Electrode it detect the
fluoride ion? Include the species of fluoride...
How does the Fluoride Ion-Selective Electrode it detect the
fluoride ion? Include the species of fluoride that need to be
considered, how to free the fluoride ion, and pH
considerations.
Fluoride Selective Ion Electrode. Describe how
a fluoride selective ion electrode measures the fluoride ion
concentration and explain why the potential approaches 0 at high
concentrations
Describe how a fluoride selective ion electrode measures the
fluoride ion concentration and explain why the potential approaches
0 at high concentrations
ION-SELECTIVE ELECTRODE POTENTIOMETRY
The fluoride ion concentration in a mouthwash sample was
determined using ISE. Potentials of standard solutions containing
fluoride ion are given in Table 1. The sample for ISE was prepared
by pipetting 10.00 mL of the original mouthwash and diluting to
250.00 mL. The potential of the sample was recorded as –0.015
V.
Table 1. Measurement of ISE potential of standard solutions
containing fluoride ion.
[F-], M
Potential, mV
5.0 x 10-6
0.077
5.0 x 10-5
0.020...
Lab Purpose: Determine the concentration of fluoride in
mouthwash or toothpaste using an ion selective electrode (ISE) will
be used to determine the concentration of F- in a sample of
mouthwash or toothpaste. Demonstrate Nernstian electrode
response.
1. What is the most common type of ion selective electrode?
2. Why do reactions that remove ions from solution interfere
with the operation of an ISE?
3. Why should the data for the calibration plot and unknown
values be obtained on the...
Lab Experiment: Fluoride Speciation and Analysis by Flow
Injection using Ion-Selective Electrode.
Q1) what is the Nernst equation for the Fluoride Ion Selective
Electrode (ISE)? How does this show that measured potential is
proportional to Fluoride ion concentration?
2Q) What is a common cause of error when using a reference
electrode?
3Q) IS the pH of solutions important when using the Fluoride
ISE? If so, why?
A solid-state fluoride ion-selective electrode responds to F-but not to HF. It also responds to hydroxide ion at high concentration when. Suppose that such an electrode gave a potential of +100 mV (versus S.C.E.) in 10-5 M NaF and +41 mV in 10-4 M NaF. Sketch qualitatively how the potential would vary if the electrode were immersed in 10-5 M NaF and the pH ranged from 1 to 13.