Which hydroxide will have lowest value of solubility product at normal temperature (25oC)?
Mg(OH)2
Ca(OH)2
Ba(OH)2
Be(OH)2
A
Mg(OH)2
B
Ca(OH)2
C
Be(OH)2
D
Ba(OH)2
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Solution
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As we move down the group of alkaline earth metals lattice enthalpy decreases much faster than hydration enthalpy so solubility of hydroxides increases down the group. So Be(OH)2 is least soluble and lowest value of solubility product.
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