How Are Very Small Solution Concentrations Measured

In Chapter 17, we studied solubility equilibria and learned how tration of either ion in a saturated solution is 8.8 X 10 M. You 

An electrochemical cell is constructed for the purpose of determining the of silver cyanide (AgCN) at 25°C. One half-cell consists of a silver electrode in a 1.00 Af solution of silver nitrate. The other half-cell consists of a silver electrode in a saturated solution of silver cyanide. The cell potential is measured and found to be 0.470 V. Determine the concentration of silver ion in the saturated silver cyanide solution and the value of ATsp for AgCN. 

Strategy Use Equation 19.7 to solve for the unknown concentration of silver ion. The half-cell with the higher Ag (1.0 AT AgN03) concentration will be the cathode the half-cell with the lower, unknown Ag concentration (saturated AgCN solution) will be the anode. The overall 

Setup Because this is a concentration cell, Eceu = 0 V. The reaction quotient, Q, is (xM)/(1.00M)-, and the value ofn is 1. 

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