Chemistry Definition?

What does w/o (not without) mean?
Usage: "... with an aqueous liftoff solution of 7.5 to 8 w/o HNO3, 10.25 to 10.75 w/o H2SO4..."

Answer:
More information is needed... - what else is in the mix? But it does sound like there is an error there...

Edit - Ok a patent! - well, then w/o HNO3 means exactly that! - NO HNO3 present. The 7.5 to 8, and 10.25, 10.75 refer to concentrations (Molar) of some reactant of something - and knowing patents - they probably won't tell you what the reactants are!
I think that could be a mistake...
I've never seen that. However its obviously referencing the type of ratio and typically anything with w/ andything the w refers to weight. Normally its w/w or w/v weight wight or weigh volume. I bet it was a spelling correction program that didnt know anything about chemistry. Or else and editor that didn't.
You're using the abbreviation out of context, which makes it a bit difficult.

w/o is often used to indicate a water/oil emulsion. Hope that helps.

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