whu acid to prepare H2S from sulphide salt
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Acidic gases (e.g. hydrogen sulfide, hydrogen chloride, sulfur dioxide) can be dried with concentrated sulfuric acid, or with phosphorus pentoxide. Basic gases (e.g. ammonia) can be dried with calcium oxide, sodium hydroxide or soda lime.
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Because hydrogen sulfide combines easily with water, damage to stock tanks below water levels can be severe. Water with hydrogen sulfide alone does not cause disease. However, hydrogen sulfide forms a weak acid when dissolved in water. Therefore, it is a source of hydrogen ions and is corrosive.
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