Question

23b

23. Sodium bicarbonate (baking soda) is used to make cookies and cakes rise when buking because it decomposes with heat to produce gaseous carbon dioxide as shown below. 2 NaHCO, Na Costa HO + CO, AH° = 129.2 kmol + a) i) Determine the transition temperature of this reaction. ii) Should the temperature be above or below this value to favor the products? Briefly justify your choice. b) Sodium bicarbonate does not decompose significantly at room temperature, 25 °C Justify this statement with a calculation. There is more than one way to solve this problem. (Hint: consider which direction is meant by "decomposition")

Answer 1

23 b) since the reaction has its enthalpy a positive sign which means its an endothermic reaction.

And heat is required to decompose the sodium bicarbonate to its gaseous products..it will decompose on heating at 173°C..that's why no decomposition occurs at room temoeraturea heat inis wenot sufficient to break the molecule..as we increase the temperature reaction will go forard.