University:
Georgia Southern University
Course:
CHEM 1310 | Comprehensive General Chemistry
Academic year:

2024
Views:

433

Pages:

1
Author:

Jalen W.

Equilibrium Problem-Solving There are two types of equilibrium problems Type I: Solving for the equilibrium constant (Kc or Kp (atm)) Given: 1. equilibrium concentrations of all chemical species, or 2. initial concentrations or atms & equilibrium concentrations or atm of one of the products so that “change” (x) is a known value. Steps common to All equilibrium type I problems: 1. Equation must be balanced. 2. Write an equilibrium expression for reaction. 3. Put corresponding equilibrium concentration or atms of reactants and products into expression. 4. Solve for Kc Type II: Determining the equilibrium concentrations of reactant(s) and product(s) Given: 1. Kc or Kp and 2. the initial concentrations or atms to solve via algebraic manipulation a. perfect squares, b. use quad. Equation c. use 5% approximation rule Steps common to All equilibrium type II problems: 1. Equation must be balanced 2. Write an equilibrium expression for reaction 3. Make an ICE table ICE stands for Initial concentration, Change (+ or – x) required to reach equilibrium and in order to determine the Equilibrium concentrations or atms of the reactants & products. An example of an ICE table is given below: Determine the change required to reach equilibrium HF (aq) < ======== > H+ Initial 3.0 2.0 Change -x +x +x 2.0 + x 1.0 + x Equilibrium 4. 5. 6. 3.0 – x + F - 1.0 Place equilibrium concentration expressions from the ICE table into the equilibrium expression. Solve for x algebraically (e.g. perfect square, 5% approximation or quad. eq.) Using value of x, calculate the equilibrium concentration of reactants and products