Lab Muffin's Free Acid Calculator
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ABCDEFGHIJKLMNOPQRSTUVWXYZ
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Explanation of how to use this calculator:
https://labmuffin.com/free-acid-calculator-for-exfoliants-at-specific-ph-levels/
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Put the details of your formulation into the yellow boxes, and the
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overall % of free acid in the product will appear in the green box.
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Important note: The free acid value does not translate into specific skincare effects.
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Concentration (%)
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Overall % Free Acid
6.66%
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Do not put "%" in the above box
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pH3.8
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AcidAscorbic
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Calculation Stuff
Acid Data
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AcidAscorbicAcidProtons
Molar Mass
pKa1pKa2pKa3
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Protons1
Glycolic
176.053.83
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Molar mass176.12
Lactic
190.083.86
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pKa14.1
Mandelic
1152.153.41
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pKa2
Salicylic
1138.122.97
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pKa3TCA1163.380.66
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Concentration (M)0.5677946854
Ascorbic
1176.124.1
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Free Acid0.378230425
Citric
3192.123.134.766.39
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% Free Acid66.61394246
Malic
2134.093.45.2
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% Overall6.661394246
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