Hydration enthalpy of Group 1 cations (Magnitude of hydration enthalpy (exothermic) decreases down Group 1: Li⁺ is most heavily)
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Magnitude of hydration enthalpy (exothermic) decreases down Group 1: Li⁺ is most heavily hydrated.
What each symbol means
| Symbol | What it stands for |
|---|---|
| ΔH_hyd | Enthalpy change when gaseous ion is hydrated |
When to use this
Smaller ions bind water dipoles more strongly; Li⁺ has largest |ΔH_hyd|.