Which reaction occurs during the setting process of alginate impression materials?

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Trisodium phosphate combines with sodium alginateTrisodium phosphate interacts with calcium sulfateThe colloid transforms into a solThe portion touching soft tissues hardens lastThe material undergoes polymerization

Explanation

During the setting of alginate impression materials, trisodium phosphate reacts specifically with calcium sulfate to control the setting time. This reaction delays the availability of calcium ions, which are essential for cross-linking sodium alginate and forming the gel. Other options are incorrect because trisodium phosphate does not react with sodium alginate directly, the colloid does not convert back to sol, and the material in contact with soft tissues does not necessarily set last.