When RbOH (rubidium hydroxide) reacts with HNO3 (nitric acid), they neutralize each other to form:

* RbNO3 (rubidium nitrate), a salt

* H2O (water)

The balanced chemical equation for this reaction is:

RbOH(aq) + HNO3(aq) → RbNO3(aq) + H2O(l)

Here's a breakdown of the reaction:

* RbOH is a strong base, meaning it readily donates hydroxide ions (OH-) in solution.

* HNO3 is a strong acid, meaning it readily donates hydrogen ions (H+) in solution.

* When these ions combine, they form water (H2O).

* The remaining ions, Rb+ and NO3-, form the salt RbNO3.