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hydrosulfuric acid:see hydrogen sulfidehydrogen sulfide,
chemical compound, H2S, a colorless, extremely poisonous gas that has a very disagreeable odor, much like that of rotten eggs. It is slightly soluble in water and is soluble in carbon disulfide.
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a weak, dibasic acid, a solution of hydrogen sulfide (H2S) in water. Hydrosulfuric acid is unstable: H2S is slowly oxidized by atmospheric oxygen and sulfur is formed. The acid forms both sulfide and hydrosulfide salts.