What type of reaction occurs when baking soda & vinegar combine? Besides double replacement?

When baking soda and acetic acid react, three new molecules are formed: water (H2O), carbon dioxide (CO2), and sodium acetate (NaC2H3O2). [ Sodium acetate is also the chemical substance inside the heat packs that we use.] The chemical reaction that occurs when baking soda and vinegar mix is written below. 2.