ICE Tables and Equilibrium Concentrations Lesson Outline ICE

ICE Tables and Equilibrium Concentrations

Lesson Outline ICE Tables Calculating Equilibrium Concentrations using ICE Tables

ICE Tables ICE tables are used to find [ ]’s at equilibrium Remember this must be in a closed system I - Initial concentrations when reaction starts C- Change in concentrations as system proceeds to Eq E – Equilibrium Concentrations of the reaction Note Initial [products] = 0 (unless stated otherwise) Concentration is measured in mol/L

ICE Tables Consider the following reaction [Initial] [Change] [Equilibrium] 5. 30 -1. 32 3. 97 3. 53 -1. 32 2. 21 19. 04 +2. 64 21. 68 1. From what is given, calculate [change] for a species 2. Using stoichiometry, calculate [change] of the other species. 3. Calculate [equilibrium] of all remaining species [Change] can be + or – Whiteboard activity If reactants change is + then products change is – [Equilibrium] are always +

Example # 1 A 1. 0 L container contained 0. 750 mol of CO(g) and 0. 275 mol of H 2 O(g). Equilibrium was reached according to this equation: At equilibrium, 0. 25 mol of CO 2(g) were present. Calculate the [equilibrium] of the other reactants and products. Whiteboard activity

Example # 2 At a certain temperature, 3. 0 mol of F 2(g) and 2. 0 mol I 2(g) are introduced into a 10. 0 L container. 3 I 2(g) + 6 F 2(g) � 2 IF 5(g) + 1 I 4 F 2(g) At equilibrium [I 4 F 2(g)] = 0. 020 mol/L Calculate the change in [F 2(g) ]. Whiteboard activity

Example # 3 A 5. 0 L vessel was filled with 6. 0 mol of SO 2(g), 2. 5 mol of NO 2(g) and 1. 0 mol of SO 3(g). After equilibrium was established, 3. 0 mol of SO 3(g) were found. SO 2(g) + NO 2(g) �SO 3(g) + NO(g) What is the [SO 2(g)] at equilibrium?

Looking Forward Today E 4 questions Tomorrow The Equilibrium Constant Monday Quiz (E 4 -5)