Question

Part 2. Short answer questions. 1) A and B are volatile liquids. In the figure below, the partial pressure of A and B in a liquid solution of these two substances (at T = 40.°C) is plotted against X, the mole fraction of A in the liquid solution. 400 p(tor) 300 200 100 0 0.0 0.2 0.8 1.0 04 06 mole fraction A a) Do A and B form an ideal liquid solution (yes/no)? [4 points) b) What is the value for peº, the vapor pressure of pure liquid B, at T - 40.0°C? [6 points) . 2) For the chemical reaction CO2(g) +H:0(I) = H,CO3(aq) give the correct expression for Ke, K., and K, or explain why such an expression cannot be given. [12 points) 3) Give the formation reaction for potassium hydrogen carbonate (KHCO3(s)). [6 points]

Answer 1

* Q1.(a) Yes,the mixture of A and B forms an ideal solution,as the variation of vapour pressure shown in the graph is a straight line and follows RAOULT's law.

* (b) From the graph, the pure vapour pressure of B is 400 torr where the mole fraction of A is zero and mole fraction of B is 1.

Q2. For the given reaction, K_p or K_c cannot be written as the reaction consists of gaseous CO₂ and aqueous solution of H₂CO_3.​​​​It is mixed equilibrium, generally in Electrochemical reaction this type of equilibrium is used,like Standard hydrogen electrode.

Q3. Formation reaction in which the formation of one mole of a substance from its constituent elements occurs .

K(s) +1/2 H₂(g) + C(graphite) + 3/2O₂(g) ----> KHCO₃