exp10 - Objective To determine the percent fluoride, F- ,...

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Objective To determine the percent fluoride, F - , present in the signal2 toothpaste using fluoride selective electrode. Theory: Ion-selective membrane electrodes compose another type of electrodes in addition to the metallic indicator electrodes. In the crystal membrane electrodes, the potential develops at the surface of the membrane, which is a single crystal of lanthanum doped with some europium (II) in the case of fluoride electrode. The mentioned electrodes can be used to measure the appropriate concentration directly in the unknown solution after constructing a calibration graph using a series of solutions containing known concentrations of the desired ion. The potential of an ion-selective electrode in the presence of a single ion to which the electrode is selective may be given by Nernst equation in the following form: E = E 0 - (0.059/Z) log (a z + ) Where, E is the electrode potential E 0 constant on the reference electrode Z is the ionic charge A is the activity of the unknown ion.
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This note was uploaded on 04/13/2011 for the course CHEM 311 taught by Professor Alial-habib during the Fall '09 term at King Fahd University of Petroleum & Minerals.

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exp10 - Objective To determine the percent fluoride, F- ,...

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