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mixing pH
Making a hydrating lotion and the pH came out at 3.5
I understand I can raise the pH through Triethanalomine, Sodium Hydroxide or Arginine which I have just learnt.
I used citric acid as a chelating agent but understand it also can decrease the pH a small amount. Is it ok to keep citric acid in the product and up the pH with one of the above 3 ingredients or will that just make them work against each other.For the sake of it ingredients were:
Aqua 67%
Glycerin 4%
Xanthan Gum 0.5%
Cetearyl Olivate Sorbitan Olivate (Olivem 1000) 4%
Glyceryl Stearate 2%
Cetyl Alcohol 2%
Shea Butter 1.5%
Macadamia Oil 4%
caprylic capric triglyceride 5%
Vitamin E 0.3%
Glyceryl Caprylate/glyceryl undecylenate (plantaserv N) 1%
Lemon Lime Frag 0.3%
Citric Acid 0.2%Also after watching the Preservatives webinar yesterday I think I will add a second preservative, both at half level.
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3 Replies
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Water is 75.2 percent sorry. Not 67.
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@crillz Citric acid is a pH regulator rather than a chelator. Sodium citrate (which is the salt formed after neutralizing Citric acid with Sodium hydroxide) is a chelator, but for that you need to raise pH above 6.4 (so carboxylic groups are proton-free and can properly interact with metallic ions).
When you add an additional preservative, make it an antifungal since the system you’re using lacks of activity against mold and yeast.
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Thanks ketchito, I thought citric acid did both. Will do with the preservative
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