Nacre follows the increasing order of their PbCl (lead chloride) solubility at 25°C: PbClâ‚‚ (4.67 x 10â»Â¹), AgCl (6.8 x 10â»Â¹), and HgClâ‚‚ (1.0 x 10â»Â¹). Calculate the molar solubility and gram solubility of PbClâ‚‚ in pure water at 25°C. Calculate its Ksp (solubility product constant). The molar solubility of AgCl in pure water is 3.24 x 10â»âµ M. Determine its Ksp.