Neco 2021 Chemistry Question 8

A student is required to determine the solubility of lead(II) chloride (PbCl\(_2\)) in water at 25 °C using the experimental setup shown in the diagram. The apparatus consists of a 250 mL beaker containing distilled water, a clean funnel fitted with filter paper, a pre‑weighed dry crucible, a balance accurate to 0.01 g, and a heating mantle. The student adds excess solid PbCl\(_2\) (5.00 g) to the beaker, gently heats the mixture to maintain a constant temperature of 25 °C, and stirs until no more solid dissolves. The mixture is then filtered, and the filtrate is transferred to the pre‑weighed crucible, which is subsequently dried in an oven at 105 °C to constant mass. The mass of the empty crucible is 12.34 g and the mass of the crucible containing the dried residue is 13.19 g.