Calculating the Equilibrium Constant

• deduce the equilibrium expression (in terms of Keq) for homogeneous reactions occurring in solution
  
  

  • Writing Equilibrium Expressions + ANSWERS

  • Homo or Hetero? + ANSWERS

• perform calculations to find the value of Keq and concentrations of substances within an equilibrium system, and use these values to make predictions on the direction in which a reaction may proceed
  
  

  • Applying ICE Tables + ANSWERS

  • Calculating Keq Worksheet + ANSWERS

  • Interpreting Keq + ANSWERS

• qualitatively analyse the effect of temperature on the value of Keq
  
  

  • Keq and temperature + ANSWERS

Temperature is the only factor to affect the Keq value. 

1. Determine the enthalpy of the reaction

2. Determine shift based on temperature change 

3. Calculate new Keq from new concentrations 

• conduct an investigation to determine Keq of a chemical equilibrium system, for example:

  • Keq of the iron(III) thiocyanate equilibrium
    
    

PINV - Colorimetry of iron(III) thiocyanate equilibrium

+ Solutions

• explore the use of Keq for different types of chemical reactions, including but not limited to:

  • dissociation of ionic solutions

  • dissociation of acids and bases (ACSCH098, ACSCH099)

    • Ksp Explanation 

    • Ka Explanation 

    • Kb Explanation

    • Kp Explanation 

• Worksheet: Ksp Calculations + ANSWERS