The chemical equation for the reaction of baking soda (sodium bicarbonate, NaHCO₃) and vinegar (acetic acid, CH₃COOH) may be written as two steps. Fill in the missing information for the chemical equation and balance it. Also indicate what is the reaction type for each step.

Step 1: ________+ ______ --> CH₃COONa (aq) + H₂CO₃ (l) Reaction type:

Step 2: H₂CO₃ (l) --> H₂O (l) + _________ Reaction type:

When the bromothymol blue (BTB) was exposed to the CO₂ gas, what color was the solution? Did the BTB indicate presence of an acid or base?