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Author Topic: sodium lactate hardening in the lye?  (Read 1330 times)
merkaba
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« on: January 10, 2012, 02:09:46 PM »

Weird question, but I added the sodium lactate in with the liquid before adding the sodium hydroxide. Over the course of maybe a half hour while measuring and doing everything else, I slowly added in the sodium hydroxide and mixed it up. Towards the end it was getting too hot so i put the milk jug into a cold bath. When i was getting ready to add it I noticed some hard grainy crystal sheets at the bottom. It didn't appear to be lye since a a few swishes normally dissolves it back in the solution.

Did I add the lactate in at the wrong time?
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situ
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« Reply #1 on: January 10, 2012, 05:21:47 PM »

When I started soaping I would add the sodium lactate after adding the lye to oils.  Then I read that it should be added to the lye/water after the lye has been mixed in and just before adding to the oils, so that is what I started doing.  I didn't see any difference between the two methods but have continued to add it to the lye/water.  With all that I add after the two are mixing, at least I don't forget the sodium lactate this way.
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velvet
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« Reply #2 on: January 10, 2012, 05:48:10 PM »

Sodium lactate may have minute amounts of lactic acid present in the 60% solution you have. That free lactic acid reacts with NaOH and produces more sodium lactate, therefore crystals on the bottom. In addition if you heavily discounted water since milk was to be added, then you had a supersaturated solution of sodium lactate.

Best way to add lactate is after all NaOH is disolved.


C3H603 + NaOH --> H20 + NaC3H5O3 Lactic Acid + Sodium Hydroxide combines to form Water + Sodium Lactate.

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Martha
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« Reply #3 on: January 10, 2012, 07:03:25 PM »

OMG Velvet-- Thanks for the chem equation. I have wondered about the Sodium Lactate too and the Lye but I was too lazy to get out the chem book.  It makes sense. This is why I love the Forum.
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merkaba
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« Reply #4 on: January 11, 2012, 07:06:48 AM »

Sodium lactate may have minute amounts of lactic acid present in the 60% solution you have. That free lactic acid reacts with NaOH and produces more sodium lactate, therefore crystals on the bottom. In addition if you heavily discounted water since milk was to be added, then you had a supersaturated solution of sodium lactate.

Best way to add lactate is after all NaOH is disolved.


C3H603 + NaOH --> H20 + NaC3H5O3 Lactic Acid + Sodium Hydroxide combines to form Water + Sodium Lactate.


Thanks velvet, awesome answer!
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