Which Fluid Quaifies as Electrolyte?

[bmoorthy]

Dear All

1)What are the charecteristics and Properties of a fluid or an aglomorate to qualify as an Electrolyte so that, in its presence a Galvanic Cell is formed?
2)Does All Acid qualify as an electrolyte?
3)Does all solution with disolved salt qualify as electrolyte?
4)What is the PH beyond which a fluid will qualify as an electrolyte?
5)Just as we have electrochemical series for metal, is there an electrochemical series for Electrolyte?
6)I know that an electrolyte is expected to be a conductive fluid, but what is the coefficient of conductivity (or the threshold resistivity) beyond which a solution or fluid qualifies as electrolyte?

 

[swall]

If you look at good DI water or RO water, you will find conductivity less than 100 micro siemens. Not much of an electrolyte. City water around here is 450 to 600 microsiemens and I would consider water in that range to be a weak electrolyte. 5% salt water is around 90,000 microsiemens and that definitely is a good electrolyte.

 

[EdStainless]

Conductivity is the key.
You need to look at the ionic components of the fluid.

Not all acids will be electrically conductive at high concentrations. Once you get over 96% or so they are almost inert.
Any disolved salt will form an electrolyte.

The pH is critical depending on the metals. Just because a solution is near neutral doesn't mean that it isn't an electrolyte.

Often people talk about water's resistance (inverse of conductance). Really pure water is in excess of 20MegOhms, or less than 0.05 microsiemens. Good quality treated water will be beter than 1 MegOhm (less than 1 microseimen).
There will not be a lot of galvanic activity in waters like these.
Once you get under 10kOhm (over 100uS) you can have significant galvanic activity.
Salt water conductivity will depend on the specific salts and the dissociation coef. Almost any salt water from 1% through stauration will have resistivities less than 20ohms (cond over 50,000 uS).

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