Problem: Rank these ions by their expected hydration energy (from lowest to highest).Ga3+ , Ca2+ , K+

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enthalpy of hydration  amount of heat released when an ion is hydrated


M2+ (g) + mH2 M2+ (aq)


 atomic number   ionic size   enthalpy of hydration


ionic radius: 

  •  positive charge   ionic size

–3 > –2 > –1 > 0 > +1 > +2 > +3


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Problem Details

Rank these ions by their expected hydration energy (from lowest to highest).

Ga3+ , Ca2+ , K+

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