A solution is in equilibrium with excess CaF (s), NH Cl(s)
CHEMISTRY · Single correct · AP · Chemistry · Acids and Bases · Acids and Bases
Problem
A solution is in equilibrium with excess CaF2(s), NH4Cl(s), and PbS(s) at pH 8. The pH is slowly lowered to 2 while temperature remains constant. Which statement correctly predicts how the molar solubilities of the three salts will change?
(a) CaF2 decreases, NH4Cl increases, PbS unchanged
(b) CaF2 increases, NH4Cl unchanged, PbS increases
(c) CaF2 increases, NH4Cl increases, PbS increases
(d) CaF2 unchanged, NH4Cl decreases, PbS increases