[born2dive00]

So I am looking for a table of the water dissociation constant that is detailed with a .5'F separation, with a pH range of 1 to 14, with a .01 ph resolution or better

The closest thing I can find is tables with a 5 degree C separation, and a .1 does such a table exist?

If not can someone lead me down the right path for finding the formula, I believe that uses temperature, pressure to calculate the values...

Please let me know and thank you.

[sjb]

The closest thing I can find is tables with a 5 degree C separation, and a .1 does such a table exist?

If you plot what you have, is it well defined?

[born2dive00]

The charting is not an issue, im trying to develop a pH calculator with an accuracy of +/- .5mg per liter. With a pH accuracy of .001

The problem is the water dissassociation constant is reaking havoc due to both the temp and pressure when substance is very dilute. A change of 5 degrees C is equating to between .03 and .12 variance on the calculation depending on the solution temp and atmospheric pressure, hence I need a much more refined table, or need to know how to get the Kw dissassociation from the temp and pressure.

Any ideas?

The closest thing I can find is tables with a 5 degree C separation, and a .1 does such a table exist?

If you plot what you have, is it well defined?