Electrical Conductivity Of Aqueous Solutions Page 2

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Procedure
Safety
Be cautious with hydrochloric acid, nitric acid, sulfuric acid and concentrated acetic acid.
Although low in concentration, some individuals may have extreme skin sensitivities. If you
experience any tingling sensations or skin discolorations, rinse immediately with large amounts
of water for 15 minutes. Inform your instructor ASAP.
Personal Protective Equipment (PPE) required: lab coat, safety goggles, closed-toe shoes
Materials and Equipment
conductivity meter, wash bottle with distilled water, large beaker for rinsing/waste, small
beakers, Kimwipes, solid sodium chloride, solid calcium carbonate
Solutions: acetic acid, aluminum nitrate, ammonium hydroxide, calcium hydroxide, citric acid,
ethanol, hydrochloric acid, magnesium hydroxide, magnesium sulfate, nitric acid, potassium
iodide, sodium chloride, sodium hydroxide, sucrose
Conductivity Testing – Evidence for Ions in Aqueous Solution
1. The meter has a 9V battery, and two parallel copper
electrodes.
Use a wash bottle with distilled water and a large beaker
labeled “waste” to rinse the copper electrodes. Dry using a
Kimwipe tissue. When switched on, the lights should not be
lit any color. If they are, repeat the rinsing and drying.
NOTE: DO NOT EXPOSE THE CIRCUIT BOARD TO WATER.
Only the copper electrodes should be rinsed with water.
2. Place the meter so that the circuit board is facing up (the battery will be below). Always
place the meter in this way so that the circuit board will not get wet. On this side, there is a
guide to the possible conductivity measurements:
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
Switch the meter on and dip the copper electrodes to test conductivity.
Thoroughly rinse with distilled water after each test, and dry with Kimwipes.
Switch the meter off between uses.
3. Place 5 mL of distilled water into a small, clean beaker. Test and record your results.
4. Place 5 mL of tap water into a small, clean beaker. Test and record your results.
2

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