Okay I joined up just to ask this. I've only worked in one lab and we order the regular 68-70% HNO3. When we say to make a 5% HNO3 solution, we'll do 5 mL of the 68% and dilute to 100mL using DI water. Now I understand this is really a solution that is less than 5% HNO3, but we refer to it as such and when I get picky about it, people say ' well its 5% conc HNO3 ' .
Do other labs practice this?