If one requires high concentration HNO3 for a single nitration step and doesnt want to mess with distilling such an unforgiving chemical-- how would he go about determining a particular concentration when extracting with DCM? Considering he has 100ml of the 70% stuff mixed with 100ml conc. H2SO4..How much of the pure stuff can be expected to extract into 200ml of DCM?? What is the minimum and upper limit of DCM to solvate all the nitric in this particular example? Can someone reference the original patent maybe??