Re: Equation for a printable titration curve

On Sat, 7 Jun 2008 00:18:29 -0700 (PDT), Mensanator
<mensanator@xxxxxxx> wrote:

On Jun 6, 11:29?pm, Quentin Grady <quen...@xxxxxxxxxxxxxxx> wrote:
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? ?

Something like this?

<http://members.aol.com/mensanator/titration/Book2.htm>

That is fabulous. Thank you.

A couple of questions.

Did you use Graphmatica, Excel or another draw package to convert the
table into a graph?

I'm assuming if I used the table of putting the last Y values first
I'd get the graph where the pH (vertical value) sweeps up rather than
down in the middle. Its the graph later on in the article for
titrating a weak acid with an alkali that I'm looking for first of
all.

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."

I love all the camouflage you've added for my blind dog; not that she
would have seen it. Waste of time trying to hide from a blind dog.
Same as trying to win a staring contest with them.

I had a dog who went blind and inspired us all by dealing with it
magnificently. Life wasn't like it is in the brochures but she didn't
read brochures anyway so she insisted on leading the way on walks.
--
Quentin Grady ^ ^ /
New Zealand, >#,#< [
/ \ /\
"... and the blind dog was leading."

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

Relevant Pages

  • Equation for a printable titration curve
    ... doing inorganic chemistry. ... familiar with Graphmatica for drawing graphs representing things like ... Does anyone have a simple equation for generating curves that look ... the common method used to estimate the pKa of a weak acid by titration ...
    (sci.math)
  • Re: Equation for a printable titration curve
    ... doing inorganic chemistry. ... familiar with Graphmatica for drawing graphs representing things like ... Does anyone have a simple equation for generating curves that look ... the common method used to estimate the pKa of a weak acid by titration ...
    (sci.math)
  • Re: Equation for a printable titration curve
    ... doing inorganic chemistry. ... familiar with Graphmatica for drawing graphs representing things like ... Does anyone have a simple equation for generating curves that look ... If sigma goes to zero, the function will be near zero for the points ...
    (sci.math)
  • Re: Equation for a printable titration curve
    ... doing inorganic chemistry. ... familiar with Graphmatica for drawing graphs representing things like ... Does anyone have a simple equation for generating curves that look ... If sigma goes to zero, the function will be near zero for the points ...
    (sci.math)