Multiple choice Baking soda is a mixture of: Sodium carbonate and acetic acid Sodium carbonate and tartaric acid Sodium hydrogen carbonate and tartaric acid Sodium hydrogen carbonate and acetic acid Reveal answer Fill a bubble to check yourself C Correct answer Explanation Baking powder is a mixture of baking soda (sodium hydrogen carbonate) and a mild edible acid like tartaric acid. When mixed with water, the acid reacts with the base to release carbon dioxide.