will other gas producing reactions work? ( baking soda and vinegar?) Explain?

Answer 1

Making volcanos, eh? Vinegar drops the pH so that the equilibrium between dissolved CO2 and HCO3- is shifted. At atmospheric pressure, the limit to the amount of CO2 in water is LESS than would be created from the shift of HCO3-, so the remainder becomes CO2 gas.

There are not too many acids like CO2. However, you can do acid-base reactions with acids with appreciable vapor pressure (lemon juice, vinegar) and ammonia-water. Just blow across the top of the ammonia-water and a precipitate should form as the ammonia in air reacts to with the acid to form a salt.