Rubidium carbonate

White odorless solid

Fixed

3.55 g · cm -3

837 ° C

• Very well in water ( 4500 g · l-1 at 20 ° C)
• Sparingly soluble in ethanol

Attention

2630 mg · kg -1 ( LD50, rat, oral)

-1136.0 KJ / mol

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Rubidium carbonate is a chemical compound selected from the group consisting of rubidium and carbonates.

Production and representation

Rubidium carbonate can be obtained by reaction of ammonium with rubidium.

Another method is the oxidation of Rubidiumoxalat.

In the processing of the mineral lepidolite, a mixture of potassium carbonate, rubidium and cesium.

Properties

Physical Properties

Rubidium carbonate is a white, odorless, moisture-sensitive, air-sensitive, hygroscopic solid. He appears in three different crystal modifications, which at room temperature is present only the alpha form. The space groups for the modifications are P21 / c ( lattice parameters a = 734.4 pm, b = 1011.6 pm, c = 587.26 pm, and four formula units per unit cell), Pnma and P63/mmc. So that they correspond to those of potassium and cesium.

In 100 g of absolute ethanol dissolve 0.74 g of rubidium carbonate.

The standard enthalpy of rubidium carbonate is -1150 kJ · mol -1.

Chemical Properties

Rubidium carbonate dissociates above 900 ° C.

When introducing carbon dioxide into the aqueous solution, Rubidiumhydrogencarbonat forms.

When heated with magnesium in a hydrogen stream to Rubidiumhydrid forms.

Use

Rubidium carbonate is used for the production of special glasses, and as a catalyst for the production of short-chain alcohols of natural gas and the production of other rubidium.

Rubidium can be used for the analytical separation of rubidium and cesium, as it is hardly soluble in ethanol, but is highly soluble cesium carbonate.