Equation for a printable titration curve

G'day G'day Folks,

I've been called upon to coach some tertiary technician students
doing inorganic chemistry. When tutoring electrical theory I became
familiar with Graphmatica for drawing graphs representing things like
three phase, harmonics etc. That was straight forward enough since
the equations were relatively simple and easy to adjust by trial and
error.

The curves that are produced when one titrates a weak acid with an
alkali look similar to a sigmoid curve though not so symmetrical.

Does anyone have a simple equation for generating curves that look
like titration curves?

They don't have to be accurate, just good enough to be able to teach
the common method used to estimate the pKa of a weak acid by titration
with an alkali.

For those who would like to help being familiar with Graphmatica but
not with chemistry; I'd like to produce curves similar but not
identical to those found in the article located with the following
URL.

http://www.chemguide.co.uk/physical/acidbaseeqia/phcurves.html

Thank you and best wishes,
--
Quentin Grady ^ ^ /
New Zealand, >#,#< [
/ \ /\
"... and the blind dog was leading."

http://homepages.paradise.net.nz/quentin
.

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