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What would be the pH of this pre shampoo treatment?
This product is used before shampoo to remove calcium from hair. It has 3% citric acid. What would it’s pH be?
LOI
AQUA / WATER / EAU ●GLYCERIN ●PROPYLENE GLYCOL●GLYCINE ●CITRIC ACID ●PEG-40 HYDROGENATED CASTOR OIL ●SODIUM HYDROXIDE ● PARFUM / FRAGRANCE ●CETRIMONIUM CHLORIDE ● POLYSORBATE 20 ●POLYSORBATE 80 ● PHENOXYETHANOL ●HYDROLYZED VEGETABLE PROTEIN PG-PROPYL SILANETRIOL ●HYDROXYPROPYL GUAR ●HYDROXYPROPYL GUAR HYDROXYPROPYLTRIMONIUM CHLORIDE ●QUATERNIUM-80 ●LIMONENE ●LINALOOL ●SODIUM BENZOATE ●CITRAL ●POTASSIUM SORBATE ●
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5 Replies
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Approximately pH2.80
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Thank
This product claims that it removes calcium from hair.
Is pH 2.8 because citric acid chelates calcium better at that pH? Or because at pH 2.8 hair has positive charge?
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I wouldn’t rely on citric acid as a chelant, since you don’t have free electrons to interact with metal ions (which you have in citrates); rather, you have protonated groups that at most have a dipole (a ion-dipole can be feasible, but metal ions would compete with hydrogen bonds).
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There are actually few studies using low pH formulas to improve hair properties. Keep also in mind that while water wets hair, there’s dilution and an increasing raise in pH until the solution has the same pH of water, so no change on skin. A different story is the lipid removal from surfactants.
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Thank
So by what mechanism do you think this product removes calcium from hair?
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