Question

The solubility product of \(PbCl_2\) at \(298\ \text{K}\) is \(3.2 \times 10^{-5}\). What is its solubility in \(\text{mol dm}^{-3}\)?

• A. \(8 \times 10^{-6}\)
• B. \(2 \times 10^{-2}\)
• C. \(5.6 \times 10^{-3}\)
• D. \(5 \times 10^{-2}\)

Hint:

For salts of the type: \[ MX_2 \rightleftharpoons M^{2+} + 2X^- \] Always remember: \[ K_{sp} = 4s^3 \] Examples:
• \(PbCl_2\)
• \(CaF_2\)
• \(BaI_2\) This shortcut helps solve numerical questions very quickly.

Answer 1

The Correct Option is B