Ray, about all I know on buffers is "A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid."
For application in emulsion making, that's about it for me. Oh, citric acid buffers I think are OK, but there's some acids/salts you don't want to use in emulsion making.
Unless you want a 15 minute class, we'll need someone else to teach it!

Adv Reply