Properties Rubidium oxide Rb2O:

Yellowish-white, when heated turns bright yellow. Volatile in a vacuum. Sensitive to light (darkens and decomposes). Stable in a clean, dry air. Shows the basic properties, reacts vigorously with water (is formed strongly alkaline solution), acids, acid oxides, liquid ammonia.

Obtaining rubidium oxide Rb2O:

2Rb + 2RbOH = 2Rb2O + H2 (400°C).

4Rb + O2 = 2Rb2O (cold).

Rb → (O2) Rb2O2 → (O2, time) → RbO2↓ (-50°C, in the liquid NH3),

RbO2 → (-O2)(400-800°C) → Rb2O2 → (-O2)(t>1010°C) → Rb2O,

2RbO2 = Rb2O2 + O2 (290°C, vacuum).

Rb2CO3 = Rb2O + CO2 (t>900°C, vacuum).

Сhemical reactions with rubidium oxide Rb2O:

2Rb2O = Rb2O2 + 2Rb (400-550°C).

Rb2O + H2O = 2RbOH.

Rb2O + 2HCl(diluted) = 2RbCl + H2O.

Rb2O + CO2(moisture) = Rb2CO3,

Rb2O + H2O + 2CO2 = 2RbHCO3 (normal temp.).

Rb2O + NH3 (liquid) → (time) → RbNH2↓ + RbOH (-50°C).


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