MCQ
If the solubility product of $BaS{O_4}$ is $1.5 \times {10^{ - 9}} $ in water, its solubility in moles per litre, is
  • A
    $1.5 \times {10^{ - 9}}$
  • $3.9 \times {10^{ - 5}}$
  • C
    $7.5 \times {10^{ - 5}}$
  • D
    $1.5 \times {10^{ - 5}}$

Answer

Correct option: B.
$3.9 \times {10^{ - 5}}$
(b) $BaS{O_4}$ $ \rightleftharpoons $ $B{a^{2 + }} + SO_4^{ - \, - }$

Solubility constant $ = S \times S$

$1.5 \times {10^{ - 19}} = {S^2}$;$S = \sqrt {1.5 \times {{10}^{ - 19}}} $;$S = 3.9 \times {10^{ - 5}}$

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