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Unformatted text preview: Abstract: In this experiment the mass of fluoride was found out 4.26X10-3 g. Also, the percentage of fluoride in the toothpaste were found out . 178% and .144% respectively. Moreover, the slope was observed 0.056921 V/decade. The error was calculated 3.69%. Introduction: 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 = E0 - (0.059/Z) log (aE = E0 - (0....
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This note was uploaded on 03/24/2011 for the course CHEM 323 taught by Professor Basimali during the Fall '09 term at King Fahd University of Petroleum & Minerals.
- Fall '09