Aqua regia
Aqua regia
Mixture of nitric acid and hydrochloric acid in a 1:3 molar ratio.
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Readers' pathsAug 2026 – Oct 2026
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Chloroauric acid
Chemical compound.
10%
Piranha solution
Oxidizing acid mixture containing sulfuric acid and hydrogen peroxide.
7.4%
Nitric acid
Highly corrosive mineral acid.
6.6%
Noble metal
Metallic elements that are nearly chemically inert.
6.1%
Nitrosyl chloride
Chemical compound.
5.5%
Hydrochloric acid
Aqueous solution of hydrogen chloride.
4.5%
NMR tube
Laboratory glassware.
2.8%
NFPA 704
Hazmat labeling system.
2.4%
Nitrogen dioxide
Compound containing nitrogen and oxygen.
2.3%
Precipitation (chemistry)
Chemical process leading to the settling of an insoluble solid from a solution.
2.2%
Readers come from
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Titanium
Chemical element with atomic number 22 (Ti).
12%
Suns in alchemy
Sun symbols have a variety of uses.
8%
Niels Bohr
Danish physicist (1885–1962).
5.9%
Gold
Chemical element with atomic number 79 (Au).
5.8%
Platinum
Chemical element with atomic number 78 (Pt).
5.4%
Hydrochloric acid
Aqueous solution of hydrogen chloride.
5.2%
Chlorine
Chemical element with atomic number 17 (Cl).
4.8%
Alchemical symbol
Symbols used in pre-19th-century chemistry.
4.4%
Piranha solution
Oxidizing acid mixture containing sulfuric acid and hydrogen peroxide.
3.5%
John Dillinger
American bank robber (1903–1934).
2.8%