Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

D/a
Proportional to √D
D/2a
Dependent on the Reynolds number

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Mass Transfer
The rate of solid-liquid extraction is limited by the

All of these
Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution
Phase change of the solute as it dissolves in the solvent
Diffusion of the solute through the solvent in the pores to the outside of the particle

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