Question

RbOH растворимое или не растворимое основание?

Answer 1

Растворимое
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Answer 2

Solubility of RbOH

RbOH is soluble in water. It is one of the strong bases and therefore readily dissociates in water.

Source: Title: ' : ' Snippet: "(): LiOH, NaOH, KOH, RbOH, CsOH, Ca(OH)2, Sr(OH)2, Ba(OH)2."

This information is consistent with the general solubility trend of alkali metal hydroxides, where compounds like RbOH are known to be soluble in water.