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pH and BHA’s solubility
Hello, I want to ask something about the relationship between pH and solubility of BHA.
Today I did a serum with 1% BHA. I mix 1% BHA with 12% PG and 10% ethanol, then I add this phase (now I call it phase B ) to water, and the recrystallization appeared. The pH is 3.1
After that, I did another experiment, I add more TEA (triethanolamine) to the water, then I add phase B (BHA+PG+Ethanol) into water and no recrystallization happened. Now pH is 3.5
I wonder if the pH will affect the solubility of the BHA? Or any reaction happened?
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1 Reply
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I believe that would be the case, so i normally have mine at close to pH 4.
Ref to this post https://chemistscorner.com/cosmeticsciencetalk/discussion/1991/how-to-keep-salicylic-acid-from-crystallizing-out-of-my-gel-peel
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