uble Displacement and Decomposition in One How Does a Fire E

uble Displacement and Decomposition in One: How Does a Fire Extinguisher Really Work? I. Description of the reaction between sodium carbonate and hydrochloric acid. 2. What happens to the flame? Why? thee\'s no oxigen 3. Molecular equation for the eaction 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?

Solution

3)   

Na₂CO₃(s) + 2HCl(aq) - - - - - > 2NaCl(aq) + CO₂(g) + H₂O(l)

4)

The above molecular reaction is taking place in two steps

i) double displacement reaction

Na₂CO₃(s) + 2HCl(aq) - - - - - - > H2CO3(aq) + 2NaCl(aq)

in this reaction cations and anions are replacad their places to form a new compound.So, this reaction is called double displacement reaction.

ii) H₂CO₃ is unstable and decomposed into CO₂ and H₂O

H₂CO₃(aq) - - - - - > H₂O(l) + CO₂(g)

So,the reaction between sodium carbonate and hydrochloric acid is both double displacement and decomposition reaction.