Sodium Hydrogen Carbonate Decomposes Above 110°C to Form Sodium Carbonate

question 47

Multiple Choice

Sodium hydrogen carbonate decomposes above 110°C to form sodium carbonate, water, and carbon dioxide. 2NaHCO₃(s) Na₂CO₃(s) + H₂O(g) + CO₂(g)
One thousand grams of sodium hydrogen carbonate are added to a reaction vessel, the temperature is increased to 200°C, and the system comes to equilibrium. What happens in this system if another 50 g of sodium carbonate are now added?

• A) The partial pressure of carbon dioxide will increase.
• B) The partial pressure of carbon dioxide will decrease.
• C) The partial pressure of carbon dioxide will be unchanged.
• D) The amounts of all products will be greater when equilibrium is reestablished.
• E) None of the above conclusions is justified without knowing the equilibrium constant.

---

Definitions:

Straight-Line

A method of calculating depreciation of an asset that evenly spreads the cost over its useful life.

Useful Life

The estimated duration a fixed asset is expected to be economically usable, with normal repairs and maintenance, for its intended purpose.

Cash Payback Period

The duration it takes for an investment to generate an amount of cash equal to the initial investment cost.

Salvage Value

The estimated residual value of an asset at the end of its useful life, representing what it could be sold for or its scrap value.