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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Mass Transfer
In a counter-current liquid extractor

Both liquids can have any desired flow rate
Only one of the liquids may be pumped at any desired rate
Both liquids flow at fixed rate
Liquid's flow rate depends upon the temperature and pressure

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