Salt Water VS Fresh Water

By Ethan Cross


Purpose Statement

The purpose of this experiment is to see if saltwater is more conductive than freshwater. I became interested in this experiment because I would like to know if salt increases water’s conductivity. The information gained from this experiment will help decide what water will be better for a water wire and decide safety regulations.


Pure water actually acts as an insulator. Since water almost always contains other substances, the only place to find “pure” water would be in a laboratory. Most of the chemicals in water either help you or are harmless, but in open bodies of water you should test or boil the water before you drink it.

Salt cannot conduct electricity. Salt can only conduct electricity when melted or put in a solution. Salt in a pure form is considered a metal.


My hypothesis is salt water is more conductive. I base my hypothesis on what I learned in my research.


Glass cups



9v Batteries




Aligator Clips

Shallow tupperware container

CV: Water Amount

CV: Type of Battery

IV: Salt

DV: Electricity Received by Voltmeter

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  1. Get all materials together

  2. Fill 3 glasses with 100 mL of water.

  3. Add 1 tbs. of salt to one cup and label it.

  4. Add 3 tbs. of salt to one cup and label it.

  5. Stir in salt until water salt is all disolved.

  6. Hook up alligator clips to wire.

  7. Hook up wire to 9v battery (one on each top part)

  8. Pour one glass of water into tupperware and put envalope underneath.

  9. Take wire and on paperclip(so it’s same for all of them) in a container.

  10. Record highest volts with voltmeter over 5 seconds.

  11. Dump out water and clean out container.

  12. Repeat steps 5-11 and for the other 2 glasses.
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Observations Log

Electrolysis happend causing the water to seperate into hydrogen and oxygen. It also caused the salt in the water to seperate into sodium and chlorine gas.


The original purpose of this experiment was to find if salt water was more conductive than fresh water.The results of the experiment were salt water was more conductive than freshwater.


No salt=1.99 volts

1 Tbs.=3.2 volts

3 Tbs.=3.94 volts

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My hypothesis was salt water is more conductive than fresh water. The results indicate that this hypothesis should be considered correct. Based on the results of this experiment, salt provides better conductivity for water and would make water more dangerous to lightining. If I were to conduct this experiment again I would try different substances and use more water.


Connor Cross

Nicole Cross

Mrs. Cunningham