Question: what happens if you mix baking soda with lemon juice?
Answer: When the acid of the lemon juice (citric acid) came in contact with the carbonate base (baking soda) a chemical reaction took place, creating carbon dioxide gas (CO2). As you may know, CO2 is the same gas that is added to sodas to give them their fizz. This reaction requires an acid and a base in order to take place.