Lab 9
Laboratory 9
Lab title: Conductivity of solutions and Household Items
PURPOSE: To understand the compounds that dissociate (break into ions) when dissolved in water. Determine ionic compounds are electrolytes.
To identify solutions as electrolytic and non-electrolytic, and to identify variations in conductivity among electrolytes. Substances that are capable of conducting an electric current in solution are known as electrolytes. Substances that do not conduct an electric current in solution are known as non-electrolytes. Among electrolytes, the ability to conduct varies greatly. Some substances are excellent conductors, while others conduct only slightly.
What could/should be observed: If the compound conducts electricity the light-bulb would light up. If it was a very good conductor then it would be really bright (shown on table below by the ++1 strong electrolyte) if the compound was a good conductor or a poor conductor the bulb would faintly light up (shown on table below by the +1 weak). If it doesnt conduct then the light-bulb did not light up at all (shown on table below by the n× non-electrolyte)
Materials:
Conductivity apparatus
Sandpaper
Small disposable plastic cups
Safety Goggles
Distilled water
Purified "drinking" water
Cooking oil
Gatorade
Windex
Kitchen or bathroom surface cleaners
Listerine or Scope
Baking Soda (solution)
Tums (solution)
Dishwashing/laundry detergent
Tap water
Table salt
Sugar
Spoon
Sharpie® marker
Procedure: 1. Graduated cylinder to measure out approximately 100 mL of distilled water and place it in a very clean glass. In a separate clean glass, measure out 100 mL of tap water.
2. In a third clean glass, measure out 100 mL of purified drinking water.
3. Test all three types of water using the conductivity apparatus by carefully placing the exposed metal portions of the electrodes in the solutions to be tested.
4. Watch the relative strength of the LED light on
Lab title: Conductivity of solutions and Household Items
PURPOSE: To understand the compounds that dissociate (break into ions) when dissolved in water. Determine ionic compounds are electrolytes.
To identify solutions as electrolytic and non-electrolytic, and to identify variations in conductivity among electrolytes. Substances that are capable of conducting an electric current in solution are known as electrolytes. Substances that do not conduct an electric current in solution are known as non-electrolytes. Among electrolytes, the ability to conduct varies greatly. Some substances are excellent conductors, while others conduct only slightly.
What could/should be observed: If the compound conducts electricity the light-bulb would light up. If it was a very good conductor then it would be really bright (shown on table below by the ++1 strong electrolyte) if the compound was a good conductor or a poor conductor the bulb would faintly light up (shown on table below by the +1 weak). If it doesnt conduct then the light-bulb did not light up at all (shown on table below by the n× non-electrolyte)
Materials:
Conductivity apparatus
Sandpaper
Small disposable plastic cups
Safety Goggles
Distilled water
Purified "drinking" water
Cooking oil
Gatorade
Windex
Kitchen or bathroom surface cleaners
Listerine or Scope
Baking Soda (solution)
Tums (solution)
Dishwashing/laundry detergent
Tap water
Table salt
Sugar
Spoon
Sharpie® marker
Procedure: 1. Graduated cylinder to measure out approximately 100 mL of distilled water and place it in a very clean glass. In a separate clean glass, measure out 100 mL of tap water.
2. In a third clean glass, measure out 100 mL of purified drinking water.
3. Test all three types of water using the conductivity apparatus by carefully placing the exposed metal portions of the electrodes in the solutions to be tested.
4. Watch the relative strength of the LED light on