Sodium carbonate, an important chemical used in the production of glass, is made from sodium hydrogen carbonate by the reaction

Data for the temperature variation of K for this reaction are K = 1.66 x 10^-5 at 30 °C; 3.90 x 10^-4 at 50 °C; 6.27 x 10^-3 at 70 °C; and 2.31 x 10^-1 at 100 °C.

(a) Plot a graph similar to Figure 13-10, and determine Δ_rH° for the reaction.

(b) Calculate the temperature at which the total gas pressure above a mixture of NaHCO₃(s) and Na₂CO₃(s) is 2.00 bar.

Figure 13-10

Transcribed Image Text:

2 NaHCO3(s) - Na₂CO3(s) + CO₂(g) + H₂O(g)