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Physical properties
Pure nitric acid is colorless transparent liquid, concentrated nitric acidconcentrated nitric acid is colorless liquid, under normal circumstances, it is colorless transparent liquid, with suffocating pungent odor. Concentrated nitric acid content is about 68%. Relative density (d204) is 1.41, melting point is -42℃ (anhydrous)[9], boiling point at 120.5℃ is (68%).