Calcium propionate is a salt that consists of calcium ions (Ca2+) and propionate ions (CH3CH2COO-). When calcium propionate reacts with hydrochloric acid (HCl), the following chemical reaction occurs:

Ca(CH3CH2COO)2 + 2HCl → CaCl2 + 2CH3CH2COOH

The products of this reaction are calcium chloride (CaCl2) and propionic acid (CH3CH2COOH). Calcium chloride is a soluble salt that dissolves in water to form calcium ions (Ca2+) and chloride ions (Cl-). Propionic acid is a weak organic acid that has a pungent odor.