When a recipe calls for 1:1 25 mM AmBic/50% ACN, how is that prepared?

This nomenclature has confused me for years, and I have been told different answers. Does 1:1 25 mM AmBic/50% ACN refer to A) a final concentration of 25 mM AmBic and 50% ACN, B) equal amounts...

14 February 2020 8,553 2 View