When a suspended solid dissolves in acid, the dissolved ions can diffuse further into the suspension. In many cases, these diffusing ions will effect precipitation of the same solid that was initially dissolved. This effect, which depends on a non-linear solubility, can usually be successfully predicted by assuming that the process is diffusion controlled. The predictions depend on diffusion and dissolution proceeding in parallel, and so represent an extension of earlier analyses where diffusion and reaction occurred sequentially.
Bibliographical noteFunding Information:
Acknowledgements-This work was principly supported by the National Science Foundation grant CPE X0-17376. Other significant support came from the National Science Foundation grant CPE SO-25304 and from the Department of Defence grant DAAG29-81-K-0099.