esthetician922
Member

in General

So if my formula calls for 2.5% sodium pca and the one I bought from lotion crafter is sodium pca 50% do I need to add more sodium pca and less water?

## Comments

For most basic formulas you’re concerned with C1V1 = C2V2

However, for cosmetic formulations we do everything by weight (not by volume) so you just need to replace V (volume) with W (weight).

Following letsalcidos system you would set it up like this:

(x) what % of your lotioncrafter material to put in multiplied by

(0.5) 50% concentration of your lotioncrafter material)

=

(2.5%) how much pca you want to end up with multiplied by

(1) 100% 'pure' sodium pca concentration

x*0.5 = 2.5 *1

solve for x