The solubility of a salt of weak acid $( A B )$ at $pH 3$ is $Y \times 10^{-3} mol L ^{-1}$. The value of $Y$ is . . . . . (Given that the value of solubility product of $A B \left( K _{ sp }\right)=2 \times 10^{-10}$ and the value of ionization constant of $\left.H B \left( K _{ a }\right)=1 \times 10^{-8}\right)$

  • A

    $4.40$

  • B

    $4.44$

  • C

    $4.45$

  • D

    $4.47$

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