Soap pH range

At what pH range soaps can be made?
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  • The pH of soap-based paste facial cleansers manufactured by Estee Lauder, L'oreal, Uniliver, Johnson & Johnson, Shiseido, are all higher than 9, most are higher than 10. 
    So I guess maybe there really isn't anyway going lower than that, if a stable, foamy, cleanses-good soap is desired. :D
  • Soap made with oil and hydroxide  yields a product with a final pH between 9 and 10 (after completion of saponification).

    What is the pH of your soap?
    👩‍🔬🙂



  • @Abdullah it varies depending on the type of soap you'll make. Opaque soaps usually has a range of 9.5 - 12.0. While transparent soaps has 8.7-9.5
  • @zetein thanks 

    @Dr_Sara i make liquid face wash and haven't made soap yet. 
    I asked if it is possible to make soap at pH 6 or below
  • HI @Abdullah 
    You cannot make soap that is pH6 or below. You would do better using a detergent if you want a low pH.

    If you make soap with NaOH and coconut oil, you get sodium cocoate. If you add an acid, the sodium is replaced by hydrogen (sorry chemists, not very academic terminology) and you end up with an acid and lose the soap. The pH is lowered at the sacrifice of the soap/bubbly bit. 

    maybe a good example is the following
    sodium stearate (soap) vs stearic acid

    My soaps are around pH 9 
    @Dr_Sara needs a coffee...





  • Abdullah said:
    @zetein thanks 

    @Dr_Sara i make liquid face wash and haven't made soap yet. 
    I asked if it is possible to make soap at pH 6 or below
    @Abdullah what exactly is the product you want to make? Is it liquid facial wash such as Ponds from Unilever?
  • @zacchaeus i am currently making faces wash with SLES and CAPB.

    What about pH of Shampoo bar? Does it need to be high too? 
  • If you make a shampoo bar that is soap, the pH will be high. These formulations are historic- before the availability of detergents. Personally, I do not like the way they make my hair feel. Soap-based shampoo bars are very popular with consumers limiting their plastic consumption.

    If you make a shampoo bar with detergents (ie sodium coco sulphate shampoo bars), you can lower the pH. Some add acid in various forms- citric acid, vinegar... I prefer these shampoo bars.


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