Posts: 1
Joined: Sat Feb 22, 2014 11:31 am
Occupation: Teacher

Electricity & Saltwater

Postby Clunde » Sat Feb 22, 2014 11:39 am

Why does saltwater start changing colour when an electrical current goes through it for an extended period of time?

Former Expert
Posts: 20
Joined: Sun Jan 05, 2014 1:08 pm
Occupation: Student: 12th grade

Re: Electricity & Saltwater

Postby khufker » Tue Feb 25, 2014 8:28 pm

I'm not entirely sure, but could it have something to do with the metal corroding? I'm assuming that you are using something like alligator clips and a power source to supply the electricity. How long has the current been going through the saltwater?

Posts: 20
Joined: Thu Jan 23, 2014 2:09 pm
Occupation: Student

Re: Electricity & Saltwater

Postby dpututor » Thu Mar 06, 2014 8:09 pm

Did the liquid turn a dark green color? If so, this could be caused by the oxidation of the metal on your alligator clip! I found a presentation online where a student tested whether or not there was a color change in liquids with high salt concentrations, and his salt water and "saltier" water (double the concentration of salt than in salt water) turned a dark green color after exposed to electrical current.


Return to “Grades K-5: Life, Earth, and Social Sciences”