Conversion of conductivity to molar concentration

[WayneL]

Hi



I am trying to convert pure water (0.055uS) to molality (g/mol) at 25degC.

Can anyone please help?



Cheers



Wayne

 

[Dieter Britz]

WayneL wrote:

Hi
I am trying to convert pure water (0.055uS) to molality (g/mol) at 25degC.

Can anyone please help?

Molality is defined as the number of moles per kg of solvent.
If you mean calculating the molality of the water, it is simply
the inverse of the molecular weight (in kg) of water. It comes to
roughly 55. You can take it from here.

--
Dieter Britz, Kemisk Institut, Aarhus Universitet, Danmark.

 

[WayneL]

I am conducting a series of test using 80uS water and therefore need to calc
the molarity of it.
Pourbaix diagrams are new addition to my field and I am trying to gain an
understanding of them.
If you could be so kind and shine some light on my dilemma I would be
grateful?

WayneL

<bill.sloman@ieee.org> wrote in message
news:1119084199.387764.30360@o13g2000cwo.googlegroups.com...

You are trying to generate a redox potential versus pH plot for a
specific concentration of a specific metallic ion in solution.

The molarity (concentration) of the ion in the solution is part of the
data you need to provide before the program can makes its prediction.

If you couldn't work this out from the web-site in the first place, you
are probably trying to run before you can walk .....

-------------
Bill Sloman, Nijmegen

 

[Dieter Britz]

WAYNEL wrote:

Is it just a coincidence that the conductivity of pure water is 0.055
and the inv of the molecular weight is 55?

Yes.

For water of that purity, yes, the molality of both H+ and OH-
would be 1.0E-07. For the less pure water, see the other poster.

--
Dieter Britz, Kemisk Institut, Aarhus Universitet, Danmark.