  The physicochemical characterization of trivalent ions is limited due to a
lack of accurate force fields. By leveraging the latest machine learning force
field to model aqueous $\text{AlCl}_{3}$, we discover that upon dissolution of
$\text{Al}^{3+}$, water molecules beyond the second hydration shell involve in
the hydration process. A combination of scissoring of coordinating water is
followed by synchronized secondary motion of water in the second solvation
shell due to hydrogen bonding. Consequently, the water beyond the second
solvation penetrates through the second solvation shell and coordinates to the
$\text{Al}^{3+}$. Our study reveals a novel microscopic understanding of
solvation dynamics for trivalent ion.
