Potassium vs Sodium Hydroxide vs Other neutralizers in AHA formulas?

I'm looking to get a 5% Glycolic Acid lotion up to pH 4, and I have a customer asking for a very minimal formula without what he perceives as nasty chemicals. 

Sodium Hydroxide is OK, but is it interchangeable with Potassium Hydroxide for this kind of formula? TEA is out. Open to other gentle options :)
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  • MarkBroussardMarkBroussard Member, Professional Chemist
    Sodium Lactate
    Chemist/Microbiologist formulating in the Organic & Naturals arena under ECOCert/Natural Products Assn/Whole Foods/National Organic Program guidelines focused skincare & haircare products. 

    See website for details www.desertinbloomcosmeticslab.com
  • ZinkZink Member
    Trouble with sodium lactate is that you need 10% to get to pH 4 in a 5% Glycolic Acid solution.
  • MicroformulationMicroformulation Member, Professional Chemist
    In my experience use the Sodium Hydroxide and keep it simple. You may also want to look at some of Dupont's documents and read up on how they pre-neutralize their Glycolic acids.

    https://www.chemours.com/Glypure/en_US/products/neutralized_glypure.html

    markfuller@microformulation.com Microformulation.com Microformulation Cosmetic Consulting provides Custom Formulations for both large Commercial accounts as well as smaller entrepreneurs. We can provide Naturally compliant Formulations under the NSF, NPA, Whole Foods and USDA Organic Certifications. BS.Pharm Albany College of Pharmacy, Union University.
  • BelassiBelassi Member, PCF student
    Someone please explain how a SALT is going to act as a base. ACID+BASE->SALT+WATER. From this I do not see how a salt is going to neutralise an acid. Not to mention that for instance, sodium gluconate has pH=7. Sodium lactate has a pH of only 8, why would you use a lot of that, instead of adding lactic acid?
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • MarkBroussardMarkBroussard Member, Professional Chemist
    Sodium Lactate is a natural moisturizer, so not only does it raise the pH, you get the added benefit of increased moisturization.  It's going to be your most gentle, most natural option.

    Ask you client which they prefer:  NaOH, KOH or Sodium Lactate ... they're all going to work.  Perhaps even add 1% Panthenol.  Or, as also suggested Sodium Gluconate, AMTIcide, Panthenol and Sodium Lactate.

    @Belassi:  Lactic Acid is not going to help raise the pH, I don't think.
    Chemist/Microbiologist formulating in the Organic & Naturals arena under ECOCert/Natural Products Assn/Whole Foods/National Organic Program guidelines focused skincare & haircare products. 

    See website for details www.desertinbloomcosmeticslab.com
  • Actually any salt of a weak acid and strong base will raise PH but why complicate things when you can use NaOH?
  • BelassiBelassi Member, PCF student
    Sorry I was thinking back to front regarding lactic acid. I agree with DRBob
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
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