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Britannica Sources used in this answer

How does bromine water react with hydrogen sulfide?

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A labeled diagram highlights the chemical properties of bromine on the periodic table, showing its symbol Br, atomic number 35, electron configuration, atomic weight range, orthorhombic crystal structure, liquid state at room temperature, and classification as a halogen with strongly acidic oxides. A legend explains the icons for halogens, orthorhombic structure, strongly acidic oxides, and liquid state.
bromine Bromine.

Bromine water acts as an effective oxidizing agent. When it reacts with hydrogen sulfide, it liberates free sulfur.1