Question

what is the standard enthalpy of hydration?

Answer 1

Dear Student,

Standard enthalpy of hydration is the heat evolved when 1 mole of gaseous ions become hydrated. It is measured under standard conditions. For eg.
${\mathrm{Al}}^{3+}\left(\mathrm{g}\right)\to {\mathrm{Al}}^{3+}\left(\mathrm{aq}\right)∆\mathrm{H}{°}_{\mathrm{hyd}}=-4613{\mathrm{kJmol}}^{-1}$