When they are mixed, nitric and hydrochloric acids do NOT react exothermically, nor explosively. The only significant consequence is that the mixture of the two, called "aqua regia", is a strong oxidizing acid, strong enough to oxidize gold, for example. But on the other hand, a simple aqueous solution of sodium chloride will oxidize gold if you bubble air into the mixture of gold and NaCl solution. To summarize, I see no significant hazard in the mixture of hydrochloric and nitric acids which is greater than the hazards presented by the individual unmixed, separate, acids. In my opinion, there is no good reason to separate the two in storage. Jay A. Young ***************************************** On Thu, 29 Mar 2007 14:00:38 -0700 "Larry D. McLouth"writes: > What is your practice for storing nitric and hydrochloric acids? Do > > you keep them separated to prevent mixing? > > I realize they are intentionally mixed to make aqua regia, (under > controlled conditions using a fume hood). But this evolves chlorine > and > nitrosyl chloride gases...so there is a concern about storing these > two > acids together. > > I plan to tell our users that it's okay to keep these two acids in > the > same storage cabinet but that they should be kept on the same shelf > and > in individual photo trays to prevent accidental mixing in the event > of a > spill, leak etc. > >
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