It is real real important for anyone considering such issues as EMF
differences to understand that all EMF values are a function of the
electrolyte, and that any change in the liquid can dramatically effect the
EMF.

A classic example of this is to look at the Tin/Copper couple.  In certain
electrolytes, make that most electrolytes, Copper will immersion plate on to
Tin, implying that the Copper is more noble.  However, in other electrolytes,
Tin will immersion plate on to the Copper, implying that the Tin is more
noble.

Thus which direction the electrons flow, or indeed if they flow at all, can
be powerfully controlled by the electrolyte.

Hope this does not muddy the waters too much.

Rudy Sedlak
RD Chemical Company

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