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Rubidium hydrogen sulfate

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Related compounds
  
rubidium sulfate

Appearance
  
Crystals with no colour

Formula
  
RbHSO4

Rubidium hydrogen sulfate is the rubidium salt of sulfuric acid. It has the formula RbHSO4.

Contents

Synthesis

It may be synthesised with water and a stoichiometric amount of rubidium disulfate. Reaction takes place where there is no humidity:

R b 2 S 2 O 7 + H 2 O 2   R b H S O 4

There is an other method of creation. It is similar to the synthesis of sodium sulfate and potassium sulfate. For this reaction there need for rubidium chloride and a little bit warm sulfuric acid. Some hydrogen chloride is also produced during the reaction.

H 2 S O 4 +   R b C l   R b H S O 4 +   H C l

Properties

It is a hydroscopic compound. It has a monocline crystal structure, its structure is P21/n. Parameters of the bonding modes: a = 1440 pm, b = 462,2 pm, c = 1436 pm and β = 118,0°. Its crystals are isomorphs with ammonium hydrogen sulfate crystals.

Its standard enthalpy is −1166 kJ/mol During its dissolution in water there is 15.62 kJ/mol energy produced.

After warming up it resolves to rubidium disulfate and water:

2   R b H S O 4 R b 2 S 2 O 7 + H 2 O

Like potassium and caesium, rubidium has an other hydrogene sulfate compound as well: Rb3H(SO4)2.

References

Rubidium hydrogen sulfate Wikipedia