Ksp: Calculate from Solubility (mol/L)

Question

A student measures the CO₃^2- concentration in a saturated aqueous solution of lead carbonate to be 4.01×10^-7 M.

Based on her data, the solubility product constant for lead carbonate is _____.

Answer 1

PbCO₃(s) <==> Pb²⁺(aq) + CO₃^2-(aq)

Ksp = [Pb²⁺][CO₃^2-] = (4.01x10^-7)(4.01x10^-7)

Ksp = 1.61x10^-13