Calculate the final pH

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 =3 to maintain the final cream with pH =5.

Please help me.

Thanks

Comments

  • 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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