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| 1. | what is the aqua regina ? | 
| Answer» Aqua regiais a mixture of hydrochloric acid (HCl) and nitric acid (HNO3) at a ratio of either 3:1 or 4:1. It is a reddish-orange or yellowish-orange fuming liquid. The term is a Latin phrase, meaning "king's water". The name reflects the ability ofaqua regiato dissolve the noble metals gold, platinum, and palladium Formula:HNO₃+3HCl Boiling point:108°C Melting point:-42°C Density:1.21g/cm³ NFPA 704 (fire diamond):0 3 0OX Solubility in water:Miscible Aqua regia, mixture of concentrated nitric and hydrochloric acids, usually one part of the former to three parts of the latter by volume. This mixture was given its name (literally, “royal water”) by the alchemists because of its ability to dissolve gold and other so-called noble metals. it has power to dissolve metals. | |