June 18, 2021, 11:23:35 AM
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### Topic: Can anyone tell me where I can find an accurate and detailed KW table for water.  (Read 300 times)

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#### born2dive00

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##### Can anyone tell me where I can find an accurate and detailed KW table for water.
« on: January 06, 2021, 09:37:55 AM »
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

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##### Re: Can anyone tell me where I can find an accurate and detailed KW table for water.
« Reply #1 on: January 06, 2021, 01:09:51 PM »
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

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##### Re: Can anyone tell me where I can find an accurate and detailed KW table for water.
« Reply #2 on: January 07, 2021, 04:33:17 PM »
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?