Hello Bill:
Firstly, I apologize to the actual author, I simply cut and paste into a
file of important notes:
"KOH is not as strong as NaOH -- use 1.4 times as much KOH (actually
1.4025 times). Titration is the same, just use a 0.1% KOH solution
instead of NaOH solution, and use 1 gm of KOH for every milliliter of
0.1% solution used in the titration. But instead of the basic 3.5
grams of NaOH lye per liter of oil, use 3.5 x 1.4 = 4.9 grams of KOH.
So, if your titration was 5 ml, use 5 + 4.9 = 9.9 gm KOH per liter of
oil."
"...One more complication -- check the purity of your KOH, it's
generally not as pure as NaOH. Anhydrous grade KOH flake is usually
about 92%, sometimes less -- check the label. We use half-pearls
assayed at 85%. Adjust the basic quantity accordingly: the basic 4.9
grams would be 5.8 (5.775) grams for 85% KOH, or 5.3 (5.33) grams for
92% KOH."
Ray
On Fri, 08 Jul 2005 13:11:56 -0400, Bill Clark <[EMAIL PROTECTED]>
wrote:
Hello Keith and all,
I have a question regarding titration with KOH. When making your
titration
solution (1 g KOH/ L distilled water) is itn necesary to adjust for the
percent
of your KOH, i.e. 90.5%? I am making the adjustment for the basic 3.5
grans NaOH
to 5.4 grams KOH. However, I made no adjustments when making the
titration
solution.
Any help is appreciated.
Bill Clark
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