Tetrasodium EDTA in your water and BHT added to the oils locks down the stability of your soap. I have bars that have a 6 year cure on them and are unchanged.
I should probably also add that anhydrous lactic acid is likely not going to be seen outside of a chem lab. You can buy 88% pretty easily. So with 88% Lactic Acid we are more around:
1g of 88% Lactic acid neutralizes 0.39g of NaOH and creates 1.09g Sodium Lactate
1g of 88% Lactic acid neutralizes 0.55g of KOH and creates 1.25g Potassium Lactate
Which means if you want:
1g of Sodium Lactate you need to add 0.92g of 88% Lactic Acid and 0.35g of NaOH
1g of Potassium Lactate you need to add 0.80g of 88% Lactic Acid and 0.44g of KOH
BUT ... remember KOH is often 90% so ... to get 1g of Potassium Lactate you need to add 0.80g of 88% Lactic Acid and 0.49g of 90% KOH
Yeah, that's enough math for tonight.
See, it's always the man's fault!In this thread, you can blame Lee and his question about chelators -- he's the reason that I let my inner geek run wild for a bit.
So now that we are talking about SL ... anyone elver used Potassium Lactate? They both seem to be metallic salts resulting from the neutralization of lactic acid. One might surmise that it would be possible to make at home with lactic acid and lye ... or similar to Sodium Citrate, by adding the acid directly to the mix and accounting for the lye consumption.
Ok, you guys, some of you know I am the woman with the hardest/soap scummiest water on earth. I have tried EDTA (at .5%, it has helped a lot), and have bars w/citric acid and sodium citrate that are curing. DeeAnna, almost all the science stuff went way over my head, but it seemed like one take away is that EDTA has more "clawy"chelating properties than anything else. So if it were you, would you try to add (eg) both EDTA and Sodium Citrate or just up the amounts of EDTA solution (I use it in a 39% solution so it is dissolved, might just discount the regular water amount if it gets to the point that it matters.)
ETA: Eg, if using chelators, do they have individual qualities that might merit using a combo rather than just one? Feel free to ignore if this is one of those questions that takes too much work to answer.
I should probably also add that anhydrous lactic acid is likely not going to be seen outside of a chem lab. You can buy 88% pretty easily. So with 88% Lactic Acid we are more around:
1g of 88% Lactic acid neutralizes 0.39g of NaOH and creates 1.09g Sodium Lactate
1g of 88% Lactic acid neutralizes 0.55g of KOH and creates 1.25g Potassium Lactate
Which means if you want:
1g of Sodium Lactate you need to add 0.92g of 88% Lactic Acid and 0.35g of NaOH
1g of Potassium Lactate you need to add 0.80g of 88% Lactic Acid and 0.44g of KOH
BUT ... remember KOH is often 90% so ... to get 1g of Potassium Lactate you need to add 0.80g of 88% Lactic Acid and 0.49g of 90% KOH
Yeah, that's enough math for tonight.
If you mean make a 60% Sodium Lactate solution - yes. The math is nearly the same as I've showed above. If stoichiometry tells us that .81 parts of Lactic Acid combined with .35 parts of Lye gives us 1 part of Sodium Lactate, you would take the purity divided by the ratio to give you the new ratio:I'm thinking of making a liquid 60% Sodium Lactate.
Could you be kind enough to tell me how much distilled water, NaOH and Lactic Acid should I use to create around 100ml of 60% SL?
If you are off by a percent or two but still use it to make soap, it will simply use part of your intended superfat (or contribute to it). The amount is so low it's negligible compared to the amount of error there might be in the soap batch. In theory the pH of the sodium lactate solution will be neutral (7.0) but if it's not, you really have no idea how much of what to add without a titration which is a different test entirely. I'd just let it go and let it balance out in the soap.Is there anyway in the end (maybe zap or ph tapes?) that I can assure all the NaOH will be neutralized?
This is a real quick off the cuff answer, so double-check the math and/or wait to see if anyone shoots holes in my logic.
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