• Formulating

  Calculate the final pH

  Posted by Dtdang on June 24, 2018 at 3:11 am

  After completing emulsion, the temp is about 100F, pH is measured about 6 and volume = 5 oz.
  During the cooling phase, how do I calculate the volume required for glycolic acid 20% concentration, pH to maintain the final cream with pH =5.

  Please help me.

  Thanks

  Gunther replied 6 years, 10 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Gunther

  Member

  June 24, 2018 at 5:54 pm

  For some reason pH measurements in cosmestics don’t stick to what theory says.

  i.e. grab any shampoo measure its pH, 
  dilute 10x
  measure pH again
  it ain’t a whole pH point higher as theory said it would (it’s a bit less than that).

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