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ELECTRICAL CONDUCTIVITY - Cerritos College

1 ELECTRICAL CONDUCTIVITY OBJECTIVES: 1. To observe the ELECTRICAL CONDUCTIVITY of various pure liquids, ionic solids, metals and aqueous solutions using a CONDUCTIVITY probe and LED CONDUCTIVITY indicator. 2. To classify substances as strong, weak or nonelectrolytes. 3. To observe the changes in CONDUCTIVITY during the course of double displacement reactions. DISCUSSION 1. ELECTRICAL CONDUCTIVITY of molten compounds a. Ionic compounds, in the solid state, are composed of ions that are not free to move. The ions become mobile after the compound is heated to its melting temperature, becomes fluid, and the ions are freed from their positions in their crystalline lattice.

Figure 1: Light bulb conductivity apparatus The conductivity apparatus consists of an electric lamp in series with open electrodes. The electrodes will fit inside a 50 ml beaker containing the liquid to be tested. The electrodes are to be rinsed thoroughly with distilled water between testing the different samples.

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