I have horrible hard water and want to add citric acid to my shave soap. Im terrible at math. I've read and re read DeAnna's Classic Bells tutorial and think I have it right. Would someone be kind enough to check my figures pretty please? I want to use 2% Citric Acid. Total oil weight - 425 grams 2% of total oil weight is 8.5 grams Dual lye solution is KOH 62 grams and NaOH 11 grams. So I need to figure the extra NaOH to add back in. 8.5 x 6.24 / 10 = 5.34 grams of added NaOH? Is this correct? I think I've messed up somewhere since according to my calculations I'm adding almost half the total extra NaOH the recipe calls for. Also to clarify, since its dual lye I only need to calculate for the NaOH portion and not the KOH, correct?