Humic acid is non soluble in water with pH 4-7,from raw material of leonardite and lignite,Alkaline soluble. Humate is humic acid salt,have sodium salt and potassium salt .Soluble in water ,with pH 10-11. Post navigation Previous PostPrevious What is humic acid?Next PostNext What is Humic Acid ? Comment on this FAQ Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.