2
Question
Which alkaline earth metal hydroxide has highest solubility in water :
Which alkaline earth metal hydroxide has highest solubility in water :
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Solution
The correct option is B Ba
Be(OH)2<Mg(OH)2<Ca(OH)2<Sr(OH)2<Ba(OH)2
For salts of small anions ( as fluorides, hydroxides), the lattice energy decreases from Be to Ba due to increase in size. Hydration energy also decreases but this decreases is less than decrease in lattice energy . As a result hydration energy increases, Hence solubility of hydroxides increases.
Be(OH)2<Mg(OH)2<Ca(OH)2<Sr(OH)2<Ba(OH)2
For salts of small anions ( as fluorides, hydroxides), the lattice energy decreases from Be to Ba due to increase in size. Hydration energy also decreases but this decreases is less than decrease in lattice energy . As a result hydration energy increases, Hence solubility of hydroxides increases.
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