9 Baking soda sodium bicarbonate decomposes when it is heate

9. Baking soda (sodium bicarbonate) decomposes when it is heated 2NaHCO3(s), Na,CO3(s)+CO2(g)+H,0(g) Aloz +136kJ Consider an equilibrium mixture of reactants and products in a closed container. How does the number of moles of CO2 change when the mixture is disturbed by the following: a) (3 pts) Increasing the temperature b) (3 pts) Increasing the pressure c) (3 ps) Adding H20

Solution

According to the Le Chatelier\'s principle , the reaction at equillibrium , tries to re-estabilish the equillibrium by shifting in right or left when the reaction conditions are changed.

So here :

a) increasing the temperature : The number of moles of CO2 increases as the reaction moves in forward direction.

b) Increasing the pressure : The number of moles of CO2 decreases , as the reaction moves backward.

c) Adding H2O : The number of moles of CO2 decreases , as the reaction moves backward.