CESIUM SULFIDE Cs2S

Properties of cesium sulfide Cs2S:

White, heat-resistant. Anhydrous powdered Cs2S is pyrophoric in dry air. Readily soluble in water (strong hydrolysis of the anion). Reactive, in humid state oxidation by O2 of air, appends Decomposes sulfur acids. Typical reductant.

 

Obtaining metallic cesium sulfides Cs2S:

2 Cs + S = Cs2S (100—130° C).

CsH + Cl2 = CsCl + HCl (400° C),

2 CsH + 2S = Cs2S + H2S (300—350° C).

 

Сhemical reactions with cesium sulfide Cs2S:

Cs2S·4H2O = Cs2S + 4H2O (150° C, vacuum).

Cs2S (diluted)+ 12 H2O = 2[Cs(H2O)6]+ + S2-, S2- + H2O ↔ HS- + OH-; pK0 = 1,09.

Cs2S + 2 HCl (diluted) = 2CsCl + H2S↑.

Cs2S + 3 H2SO4 (conc.) = 2CsHSO4 + S↓ + SO2↑ + 2H2O.

Cs2S (solution) (-CsOH)→(O2, air), (time) S(colloid), Cs2S(n), Cs2SO3S.

Cs2S + 2 O2 = Cs2SO4 (t>500° C).

Cs2S + H2S (saturated) = 2CsHS.

 

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