[piranhagirl]

I need to make piranha solution, and my chem teacher only has 1M or 5M sulfuric acid, and 35% hydrogen peroxide. Which sulfuric acid is safer? I was going to do a 3:1 ratio, should I adjust it? Also, do I really need a fume hood, or can I just do it outside? (There is a fume hood on campus but outside would be easier)

[Hunter2]

What do you want to do with this solution?
Normaly conc. H2SO4 96-98%  and H2O2 35% is used.
5 M is roughly 40% not strong enough.
Very strong corrosive etching mixture. Careful if mixed with organics, risk of explosion. Should be used only in a safe room, also outside probably is more safe.