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

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

Grade:12th pass

1 Answers

varun
304 Points
3 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 
so 
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

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