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6-2.Equilibrium-II (Ionic Equilibrium)
medium
The hydroxides of $II^{nd}$ $A$ metal at $25\,^oC$ ,lowest value of solubility product $(Ksp)$ ?
A
$Ca(OH)_2$
B
$Be(OH)_2$
C
$Sr(OH)_2$
D
$Mg(OH)_2$
Solution
It is $Be ( OH )_2$ with a $K_{s p}$ in the $10^{-22}$ range. This is due to the fact that the $B e^{2+}$ ion is smaller than the other metal ions among the choices, which results in a tighter bond with the $OH ^{-}$ ions, thus much lower solubility. Moving downward in group $2 A$, the $K_{\text {sp }}$ 's increase due to increasing side of the metal ions and the weakening of the bond between the metal and $OH ^{-}$ ions.
Standard 11
Chemistry
