RUBIDIUM SULFIDE Rb2S

Properties Rubidium sulfide Rb2S:

White, melts without decomposition. Thermally stable. Anhydrous powdered Rb2S pyrophoric in dry air. It is readily soluble in water (the strong hydrolysis of anion). Reactive, oxidized in moist air. Decomposed by strong acids. Typical reductant.

 

Obtaining rubidium sulfide Rb2S:

2 Rb + S = Rb2S (100-130° С).

RbH + Cl2 = RbCl + HCl (400° С),

2 RbH + 2 S = Rb2S + H2S (300-350° С).

 

Сhemical reactions with rubidium sulfide Rb2S:

Rb2S·4H2O = Rb2S + 4 H2O (200° С, vacuum).

Rb2S (diluted) + 12 H2O = 2 [Rb(H2O)6]+ + S-2.

Rb2S + 2 HCl = 2 RbCl + H2S ↑.

Rb2S + 3 H2SO4 (conc.) = 2RbHSO4 + SO2 ↑ + S ↓ + 2 H2O.

Rb2S (solution) + O2(air) → (time, -RbOH) → S (colloid), Rb2(Sn), Rb2SO3S.

Rb2S (solid) + 2 O2 = Rb2SO4 (t > 500° C),

Rb2S (solution) + (n - 1)S = Rb2(Sn) (boiling, n = 2, 3, 5).

Rb2S + H2S (saturated) = 2RbHS.

 

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