Lecture Notes: Equilibrium ICE Table Practice Problems

Introduction

• Presenter: Michael from Concord Chemistry
• Topic: Equilibrium ICE Table Practice Problems
• Series: Part One
• Purpose: To demonstrate various ways ICE table problems can appear in exams.

Problem 1: Determining Equilibrium Concentration

• Given:
  • Balanced chemical reaction
  • Kc value: 7.2
  • Initial concentration of reactants: 0.2 M
  • No initial products
• Objective: Determine equilibrium concentration of the product.

ICE Table Setup

• I (Initial):
  • Reactants: 0.200 M
  • Products: 0 M
• C (Change):
  • Reactants: -x
  • Products: +2x (due to coefficient 2)
• E (Equilibrium):
  • Reactants: 0.200 - x
  • Products: 2x

Kc Expression

• Expression: ( K_c = \frac{[Brc]l^2}{[Br2][Cl2]} )
• Substitute values:
  • ( K_c = 7.2 )
  • ( 2x , (products))
  • ( 0.200 - x , (reactants))
• Simplify by taking square root of both sides.

Calculations

• Solve: ( 2.68 = \frac{2x}{0.200 - x} )
• Cross-multiply and solve for x: ( x = 0.115 , M )
• Find equilibrium concentration of BrcL: ( 2x = 0.230 , M )

Problem 2: Solving for K

• Given:
  • Balanced chemical reaction
  • Amount of SO3 and volume
  • Equilibrium values of SO2
• Objective: Solve for K.

ICE Table Setup

• I (Initial):
  • SO3: 4.0 M
  • SO2 and O2: 0 M
• C (Change):
  • SO3: -2x
  • SO2: +2x
  • O2: +x
• E (Equilibrium):
  • SO3: 4.0 - 2x
  • SO2: 2x
  • O2: x

Calculations

• Given equilibrium SO2 concentration: 1 M
• Solve for x: ( x = 0.5 , M )
• Calculate equilibrium concentrations:
  • SO3: 3.0 M
  • SO2: 1.0 M
  • O2: 0.5 M

Kc Expression

• Expression: ( K_c = \frac{[SO2]^2[O2]}{[SO3]^2} )
• Substitute values and calculate Kc: ( K_c = 0.056 )

Conclusion

• Next part will cover more formats of ICE table problems.
• Resources available for further learning:
  • Free guide: "12 Secrets to Acing Chemistry"
  • Website link: www.conquerchemistry.com/chemsecrets
  • Encouragement to continue studying and working hard.