Before the introduction of EDTA most complexation titrations used Agor CN as the titrant. The analysis for Cd+, for example, was accomplished indirectly by adding an excess of KCN to form Cd (CN)a?, and back titrating the excess CN- with Ag* , forming Ag (CN)2. In one such analysis a 0.3000-g sample of an ore is dissolved and treated with 20.00 mL of 0.5000 M KCN. The excess CN requires 13.98 mL of 0.1518 M AgNO3 to reach the end point. Determine the %w/w Cd in the ore