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Question
Solubility of the alkaline earth's metal sulphates in water decreases in the sequence :
Solubility of the alkaline earth's metal sulphates in water decreases in the sequence :
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Solution
The correct option is C Mg > Ca > Sr > Ba
The solubility of the alkaline earth's metal sulphates in water decreases in the sequence,
Mg>Ca>Sr>Ba
With the increase in the cationic size on moving down the group, the extent of the hydration of the cation decreases. Also the lattice energy decrease down the group.
For a substance to dissolve, the hydration energy must exceed the lattice energy.
For group II compounds (sulphates ), on descending the group, the hydration energy decreases more rapidly than the lattice energy. Thus, the compounds becomes less soluble as the metal gets larger.
Hence, the solubility of the alkaline earth's metal sulphates in water decreases on moving down the group.
Hence, option (c) is correct.
The solubility of the alkaline earth's metal sulphates in water decreases in the sequence,
Mg>Ca>Sr>Ba
With the increase in the cationic size on moving down the group, the extent of the hydration of the cation decreases. Also the lattice energy decrease down the group.
For a substance to dissolve, the hydration energy must exceed the lattice energy.
For group II compounds (sulphates ), on descending the group, the hydration energy decreases more rapidly than the lattice energy. Thus, the compounds becomes less soluble as the metal gets larger.
Hence, the solubility of the alkaline earth's metal sulphates in water decreases on moving down the group.
Hence, option (c) is correct.
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