Question

Amongst the following hydroxides, the one which has lowest value of $K_{SP}$ at ordinary temperature is:

• A. $Be{\left(OH\right)}_2$
• B. $Mg{\left(OH\right)}_2$
• C. $Ca{\left(OH\right)}_2$
• D. $Ba{\left(OH\right)}_2$

Answer 1

The correct option is A $Be{\left(OH\right)}_2$

The solubility product of beryllium hydroxide has lowest value.

Hydroxide	Solubility product
$Be(OH{)}_2$	$1.6\times {10}^{-26}$
$Mg(OH{)}_2$	$8.9\times {10}^{-12}$
$Ca(OH{)}_2$	$1.3\times {10}^{-4}$
$Sr(OH{)}_2$	$3.2\times {10}^{-4}$
$Ba(OH{)}_2$	$5.4\times {10}^{-8}$