Which process drives the hardening of plaster of Paris (calcium sulfate hemihydrate) when mixed with water?

💡 Explanation

When mixed with water, calcium sulfate hemihydrate undergoes hydration, resulting in ionic bonding rearrangement as it converts to gypsum (calcium sulfate dihydrate), forming a rigid interlocking crystal structure. Therefore ionic bonding rearrangement is key, rather than polymerization, cross-linking, or aggregation which don't account for the chemical transformation.

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