Increasing pH in a prepared emulsion?

AVisotskyAVisotsky Member
edited May 5 in Formulating
Hi folks,
Any way to neutralize glycolic acid in an emulsion that is already made?
Making an emulsion with glycolic acid. Came out way too strong (2.5 pH). For my home use, so I did not add a preservative. 
%%, weight
Waterthe rest
glycolic acid 8.3
Caprylic Capric Trygleciride30
Montanov 684
Behenyl Alcohol2


  • AVisotskyAVisotsky Member
    Oh wait, I just realized it is w/o, so it doesn't really have a pH, right? So I can't measure it correctly unless I measure the pH of the water phase ahead of time? 
  • AVisotskyAVisotsky Member
    Ah, no! It is actually o/w, it's miscible in water and not in oil, just checked.:) 
  • Why would you be checking whether it's miscible or not if you know what are the ingredients? This method is not as reliable as it sounds and is only useful if you don't have a list of ingredients (I can give you examples of o/w sunscreens that are absolutely not miscible with water yet it's o/w). You can't get W/O emulsion when you are using O/W emulsifier. Add NaOH and a preservative. I wouldn't trust unpreserved emulsion with pH >3.
  • AVisotskyAVisotsky Member
    @ngarayeva001 Hello and thank you. Because I didn't know to look up what kind of emulsifier Montanov 68 was :) I realize my mistake now.
    Thank you for the tip. Is NaOH added before emulsification or could it be added after? 

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