Grade 12th passInorganic Chemistry

Why does the lattice energy decreases down the group for metal hydroxides, while it remains constant for metal sulphates?

Adarsh Sinha

8 Years agoGrade 12th pass

1 Answer

varun

8 Years ago

HELLO ADARSH,

for metal hydroxides : the lattice energy decreases down the group due to increase in size of the alkaline earth metals cation whereas the hydration energy of the cation remains almost unchanged

so for metal hydroxides the lattice energy will decreases down the group

deltaH solution = deltaH lattice – deltaH hydration

Whereas for metal sulphates

the magnitude of the lattice energy remains almost constant as the sulphate is so big in size and the small increase in size of the cation from Be to Ba do not make any difference so it will remains constant

THANK YOU