removing nitric acid

[noos]

hey is it possible if you have an excess of hno3 in your aqua regia to get rid of it using ammonium chloride. hoping that the nitric acid will become hcl.

 

[Lino1406]

No. The classical method is addition of HCl...evaporating. Addition of HCl...evaporating. Addition of HCl...evaporating.

 

[FrugalRefiner]

Adding ammonium compounds to solutions containing precious metals can form extremely explosive materials!

Dave

 

[anachronism]

No. The classical method is addition of HCl...evaporating. Addition of HCl...evaporating. Addition of HCl...evaporating.

And that's so archaic that it has to go down as something from the dark ages. I can't believe you're still advocating that kind of advice.

Edit for spelling.

 

[kernels]

Yep, Sulfamic acid is the way. Urea comes in in second place. But, still try to not overuse the Nitric in the first place.

 

[Geometals]

Small additions of sulfamic acid to a warm solution with plenty of stirring. The best way to tell that the solution is nitric acid free when using sulfamic acid is by stirring and watching the bubbles. If tiny bubbles are formed at the edge of your stirring utensil, it is still reacting. Be sure to check the formulation as there are several different formulas. Make sure it is H3NSO3 or it will not convert the nitric acid to N2O.