the effect of potassium nitrate on the solubility of barium sulphate.
The common ion effect (Chapter 3) is a further important factor affecting solubilities. Addition of A or
B to the above system (equation (5.28)) will shift the equilibrium to the left and reduce the solubility of
AB. In practice, this situation would arise when an excess of a precipitating reagent has been added to
an analyte solution. Such an excess leads to the possibility of complexation reactions occurring which
will tend to increase the solubility of AB. For example, when aluminium or zinc is precipitated by
hydroxyl ions, the following reactions with excess reagent can occur