Which ion will have maximum value of heat of hydration ?
Correct answer: A. A1+3
- A. A1+3
- B. Cs+
- C. Ba+
- D. Mg+2
Explanation
Heat of hydration becomes larger as ionic charge density increases because a highly charged, small ion attracts water molecules most strongly. Al3+ therefore has a greater heat of hydration than Cs+, Ba2+ or Mg2+. Students may choose Mg2+ because it is also small and doubly charged, but the triply charged Al3+ has the greatest charge density.
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About Lattice Energy
Lattice energy describes the energy released when gaseous ions form one mole of an ionic solid, or the energy required to separate that solid into gaseous ions, depending on the convention used. Its value depends mainly on ionic charge and radius and is calculated through Born-Haber cycles.
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