Challenge Problem: Stones form in the urinary tract when certain chemicals become too concentrated in urine. By far the most common kidney stones are those formed from calcium and oxalate. Magnesium is known to inhibit the formation of kidney stones. The solubility of calcium oxalate (CaC2​O4​) in urine is 9×10−5 M. What is the solubility product, Ksp​, of CaC2​O4​ in urine?