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CBSE Class 11-science Answered

please explain the trends in hydration enthalpy and lattice enthalpy down  the group of both  alkali metals and alkaline earth metals.
Asked by Ibrahim Mohammed | 14 Jan, 2015, 08:43: PM
answered-by-expert Expert Answer

Trends in Alkali metals

Hydration enthalpy of alkali metals:

The extent of hydration depends upon the size of the ions.

Smaller the size of the ion, greater is the hydration enthalpy.

Li+ > Na+ > K+ > Rb+ > Cs+

Lattice energy of alkali metals:

The lattice energy decreases with the increase in the size of the cation i.e. from Li+ to Cs+

Trends in Alkaline earth metals

Hydration enthalpy of alkaline earth metals:

The hydration enthalpy becomes smaller as the size of the ion increases.

Be+2 > Mg+2 > Ca+2 > Sr+2 > Ba+2

Lattice energy of alkaline earth metals:

Lattice energy is directly proportional to charge and inversely proportional to the size.

On moving down the group, the metal ions increase in size and the lattice enthalpy decrease.

 

Answered by Vaibhav Chavan | 15 Jan, 2015, 12:27: PM
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