text: how can i prepare 30%hno3 from concentrated hno3 (16n)?   for reagent grade (acs specifications) nitric acid, hno3, conc., 69 to 71%, approx. sp gr 1.42, approx. 16 n, you can usually assume 70 % hno3.  for 1.00 l of 30% hno3 you would need:  30/70 * 1000 ml/l = 428.5 ml of acid diluted to 1.00 l with pure water.  alway add the acid to some of the water in a volumetric flask, then add the rest of the water to the full line.