Preparation of aqua regia?

Question

Answer

Aqua regia is an extremely corrosive mixture of nitric and hydrochloric acid, used as an etchant, for some analytical chemistry procedures, and to refine gold. Aqua regia dissolves gold, platinum, and palladium, but not the other noble metals. Here's what you need to know to prepare aqua regia and use it safely.

Reaction to Make Aqua Regia

Here is what happens when nitric acid and hydrochloric acid are mixed:

HNO3 (aq) + 3HCl (aq) → NOCl (g) + 2H2O (l) + Cl2 (g)

Over time, nitrosyl chloride (NOCl) will decompose into chlorine gas and nitric oxide (NO). Nitric acid auto-oxidizes into nitrogen dioxide (NO2):

2NOCl (g) → 2NO (g) + Cl2 (g)

2NO (g) + O2 (g) → 2NO2(g)

Nitric acid (HNO3), hydrochloric acid (HCl), and aqua regia are strong acids. Chlorine (Cl2), nitric oxide (NO), and nitrogen dioxide (NO2) are toxic.

Answer

HNO3  + H2SO4

Answer

Mix the solution in a hood with the sash between you and the solution. ... When preparing theaqua regia solution, always add the nitric acid to the hydrochloric acid slowly. Dissolving metals inaqua regia releases toxic gases, always work with aqua regia in a fumehood.

Answer

Mixture of HNO3 & HCL in 3:1...

Answer

Aqua regia must be prepared and used in a fume hood. To prepare, combine three (3) parts of hydrochloric acid to one (1) part nitric acid in a glass container. The hydrochloric acid must be measured into the glassware first, and then the nitric acid is slowly added. Never exceed 38% nitric acid.

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