Sodium carbonate can be neutralised by an acid, such as hydrochloric acid, in which case the salt is sodium chloride.
Na<sub>2</sub>CO<sub>3 (aq)</sub> + 2HCl<sub> (aq)</sub> ---> 2 NaCl<sub> (aq)</sub> + CO<sub>2 (g)</sub> + H<sub>2</sub>O<sub> (l)</sub>
Aspirin, or acetylsalicylic acid will react to form acetylsalicylate salts, such as sodium acetylsalicylate - NaC<sub>9</sub>H<sub>7</sub>O<sub>4</sub> - on reaction with an approriate base. It is a monoprotic weak acid, and thus its salts are weak bases.