The university expressly disclaims all warranties, including the warranties of merchantability, fitness for a particular purpose and non-infringement. This web site is provided on an "as is" basis. "Do not do demos unless you are an experienced chemist!" Please read the following disclaimer carefullyīy continuing to view the descriptions of the demonstrations you have agreed to the following disclaimer. Immerse the leads in the sodium chloride solution. Pour the pulverized sodium chloride into the DI water and stir.Immerse the leads in the DI water to remind the students that DI water does not conduct electricity by itself. Return the pieces of the crystal to the plastic bag and pulverize with the hammer.Display the pieces of the crystal to the class. The crystal should cleave evenly in a plane. Set it on a hard surface and rap it sharply with the hammer. Do not touch the leads! Severe shock could result! The conductivity tester does not light up. Carefully hold the crystal against the leads of the conductivity tester. The sample may be passed around if time allows. If it is a large class, use the document projector. Display the halite crystal to the class.
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