In which of the following cases would recrystallization be favored over extraction when purifying a mixture of two solid compounds? I. When the desired compound is freely soluble in the solvent pair at all temperatures. II. When a significant difference in pKa exists between the two compounds. III. When there is a significant excess of the undesired compound.

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Process Flow Diagram

A process flow diagram is a representation of various components, how they are arranged, and in what manner or sequence they work in correspondence to each other. It is a graphical way of representing a process.