Calcium acetate hydrate is used as a precursor to produce calcium ions in the development of calcium oxide based mesoporous carbon dioxide sorbent. It is an active component of pyroligneous acid-modified limestone. It is employed in the preparation of magnetite-calcium phosphate core-shell nanoparticles. It serves as a raw material in the preparation of hydroxyapatite-wollastonite composites. Further, it acts as a crosslinking agent in the microfluidic production of alginate hydrogel microbeads. In addition to this, it is used to induce crystallization of proteins.