Solubility product $\left({\text{K}}_{\text{s}\text{p}}\right)$ of saturated $\text{P}\text{b}\text{C}{\text{l}}_2$ in water is $1.8\times {10}^{-4}\text{m}\text{o}{\text{l}}^3\text{d}{\text{m}}^{-9}.$ What is the concentration of $\text{P}{\text{b}}^{2+}$ in the solution?

• Correct answer
  A

  ${\left(0.45\times {10}^{-4}\right)}^{\frac{1}{3}}\text{m}\text{o}\text{l}\text{d}{\text{m}}^{-3}$
• B

  ${\left(1.8\times {10}^{-4}\right)}^{\frac{1}{3}}\text{m}\text{o}\text{l}\text{d}{\text{m}}^{-3}$
• C

  ${\left(0.9\times {10}^{-4}\right)}^{\frac{1}{3}}\text{m}\text{o}\text{l}\text{d}{\text{m}}^{-3}$
• D

  ${\left(2.0\times {10}^{-4}\right)}^{\frac{1}{3}}\text{m}\text{o}\text{l}\text{d}{\text{m}}^{-3}$

Hence, the correct answer is option: 'A'.