MadSci Network: Chemistry

Subject: How to determine salt content in water using electricity?

Date: Mon Sep 25 23:17:17 2000
Posted by Micheline Estyphans
Grade level: 10-12 School: No school entered.
City: Sydney State/Province: NSW Country: Australia
Area of science: Chemistry
ID: 969938237.Ch

A molecule of table salt is made up of a sodium atom and a chlorine atom. 
A lone sodium atom has one more electron than necessary for stability, and 
a chlorine atom has one electron too few. So the sodium atom donates its 
electron to the chlorine atom. This leaves the sodium atom positively 
charged and the chlorine atom negatively charged, and the two stick 
together electrostatically. Salt water has a ton of mobile charged objects 
(the sodium and chlorine ions) that can flow in the direction of an 
electric field, creating a large current. However, all the research I have 
done did not specify how to determine the CONTENT of salt in the water 

Re: How to determine salt content in water using electricity?

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