Double Displacement and Decomposition in One: How Does a Fire Extinguisher Really Work? 1. Description of the reaction between sodium carbonate and hydrochloric acid. _______________ 2. What happens to the flame? Why? _______________ 3. Molecular equation for the reaction of sodium carbonate with hydrochloric acid (states of reactants and products must be shown) ____________________ 4. Why is the reaction above labeled both a double displacement and decomposition reaction? ________________