(A) Sodium hydrogen carbonate (baking soda) decomposes at elevated temperatures and is one of the sources of CO₂(g) when this compound is used in baking.

What is the partial pressure of CO₂(g) when this equilibrium is established starting with NaHCO₃(s)?

(B) If enough additional NH₃(g) is added to the flask in Example 15-11 to raise its partial pressure to 0.500 bar at equilibrium, what will be the total gas pressure when equilibrium is re-established?

Example 15-11

Ammonium hydrogen sulfide, NH₄HS(s), used as a photographic developer, is unstable and dissociates at room temperature.

A sample of NH₄HS(s) is introduced into an evacuated flask at 25 °C. What is the total gas pressure at equilibrium?

Transcribed Image Text:

2 NaHCO3(s) → Na₂CO3(s) + H₂O(g) + CO₂(g) Kp = 0.231 at 100 °C