# What do we call the energy evolved when a gaseous metal cation is hydrated by bulk water?

Jul 22, 2017

So far as I know, $\text{hydration energy}$...........

#### Explanation:

So far as I know, $\text{hydration energy}$ is the energy associated with the formation of one mole of aquated ions from one mole of gaeous cations (or anions).......

${M}^{n +} \left(g\right) + {H}_{2} O \left(l\right) \rightarrow {\left[M {\left(O {H}_{2}\right)}_{4 - 6}\right]}^{n +} + \Delta$....

Where ${\Delta}_{\text{rxn"-="hydration energy}}$

This is certainly measurable for a given series of CATIONS (if we keep the anion constant....) and hydration energy increase by an inverse proportion to the size of the ion.....