Multiple choice general knowledge What is the chemical name of Na2CO3 ? Sodium tricarbonate Sodium carbonate Sodium carbide Di-Sodium tri-carbon monoxide Reveal answer Fill a bubble to check yourself B Correct answer Explanation Na2CO3 is Sodium carbonate, commonly called soda ash or washing soda. The prefix 'tri-' would indicate three carbon atoms, which is incorrect - carbonate (CO3) is a polyatomic ion containing one carbon atom.