Diffusion of Lead Chloride Dissolved in Solid Silver Chloride

A particular solution of the differential equation of diffusion involving a diffusion coefficient proportional to concentration is presented.From previous experiments by Wagner and Zimens the diffusion coefficient for the exchange of lead and silver ions, extrapolated to the concentration of a saturated solution of lead chloride in solid silver chloride, is calculated to be 2.4·10−9 cm2/sec. at 270°C. Therefrom it follows that the self‐diffusion coefficient of lead ions equals 0.8·10−9 cm2/sec. In contrast, the self‐diffusion coefficient of silver ions, derived from conductivity measurements of Koch and Wagner, amounts to 9.2·10−8 cm2/sec.