![]() Hydrogen sulfide is slightly soluble in water and acts as a weak acid ( p K a = 6.9 in 0.01–0.1 mol/litre solutions at 18 ☌), giving the hydrosulfide ion HS − This reaction is exploited in the Claus process, an important industrial method to dispose of hydrogen sulfide. In general, hydrogen sulfide acts as a reducing agent, although in the presence of a base, it can act as an acid by donating a proton and forming SH −.Īt high temperatures or in the presence of catalysts, sulfur dioxide reacts with hydrogen sulfide to form elemental sulfur and water. ![]() Hydrogen sulfide burns in oxygen with a blue flame to form sulfur dioxide ( SOĢ) and water. A mixture of HĢS and air can be explosive. Hydrogen sulfide is slightly denser than air.
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