measuring conductance

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From: Sally Seebode (sseebode@earthlink.net)
Date: Wed Sep 03 2003 - 15:41:52 PDT 

Message-ID: <001801c3726c$91c2c100$3105060a@smuhsd.k12.ca.us>
From: "Sally Seebode" <sseebode@earthlink.net>
Subject: measuring conductance
Date: Wed, 3 Sep 2003 15:41:52 -0700

Hi,
I am trying to do an AP chemistry lab from Ebbing. The lab has students
measure teh conductance of different solutions. The outcome to see that
molecular do not conduct and ionic do, that strong and weak acids conduct
differently, that concentration affects conductivity, and that mixtures
conductivity is not always additive.

It requires a conductance cell or conductance meter. I have voltmeters and
ammeters. Are these the same?

If a voltmeter works, how do you make it work? I have tried putting the
electrodes in solution and measuring current (but why would there be
current?), and I get no reading. If I measure potentials, I get numbers, but
no consistent reading. If I add a battery, I get constant reading for
potential, but it doesn't vary from solution to solution.

Any suggestions?
Has anyone ever done this?

sally

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