IONS In this experiment you will discover that some solutions contain ions, thus allowing them to conduct electricity. The more ions there are in solution, the greater the current. Safety 1. Wear goggles 2. Tie hair back 3. Correct shoes Procedure 1. Examine the conductivity apparatus. There are two LED’s – one green and one red. It takes more current to light the green than the red. There is an on/off switch that you need to use between tests. 2. The following scale is used to express the conductivity Scale Red LED Green LED Conductivity 0 Off Off Low or None 1 Dim Off Low 2 Medium Off Medium 3 Bright Dim High 4 Very Bright Medium Very High 3. Place about five drops of the substances to be tested into the appropriate wells of the well plate using the pipettes in the stock solutions. Use the diagram in the plastic sheet for correct placement. 4. Make sure that the two copper electrodes are parallel to each other and not touching. 5. Turn on the conductivity tester. 6. Dip the electrodes into the substance to be tested. 7. Observe the brightness of the red and the green LEDS by looking straight on. 8. Turn off the tester. Rinse the electrodes with distilled water. 9. Repeat for each sample. 10. When complete, rinse and dry the electrodes, Rinse the well plate and clean your area. Wash your hands.
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