硝酸的酸性较硫酸和盐酸小，易溶于水，在水中完全电离，常温下其稀溶液无色透明，浓溶液显棕色。
Nitric acid is sulfuric acid and hydrochloric acid small, easily soluble in water, in the water under the ionization completely colorless transparent, strong dilute solution show brown solution.
亚硫酸根离子可把溴由棕色变成无色。
Sulphite SO 3 can turn bromine water from brown to colorless.
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