A simple determination of the Ag_2O solubility product by potentiometric determinations of both Ag~(+1) and OH~(-1)

摘要

A simple determination of the Ag_2O solubility product, K _(sp), suitable for introductory, analytical, or physical chemistry courses is presented. Two pH meters are required and 10~(-4) mol of AgNO_3 or AgOAc is consumed. The concentration cell, Ag(s) | Ag ~+ (0.001 M) || Ag~+ (0.001 M) {pH electrode} | Ag(s), is used. The cell potential and pH are monitored as standard 0.1 M NaOH is titrated into the cathode compartment, precipitating Ag_2O. The cathode pOH, pAg, and pK_(sp) are computed at each point of the titration. The results illustrate theoretical expectation and are in excellent agreement with the literature.