Reaction Quotient Calculator

Calculate Reaction Progress

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Reaction Quotient Calculator

Calculate Q and predict reaction direction

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Equilibrium Prediction Calculator

Predict equilibrium concentrations

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Reaction Progress Calculator

Calculate reaction progress variable (ξ)

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Understanding Reaction Quotient

Basic Concepts

Key principles:

  • Reaction quotient (Q)
  • Equilibrium constant (Keq)
  • Reaction direction
  • Concentration effects
  • Temperature effects

Reaction Direction

Relationships:

  • Q < Keq (forward)
  • Q = Keq (equilibrium)
  • Q > Keq (reverse)
  • Dynamic equilibrium
  • Steady state

Applications

Common uses:

  • Equilibrium prediction
  • Reaction monitoring
  • Process optimization
  • Yield calculation
  • Reaction control

Factors

Important aspects:

  • Concentration changes
  • Temperature effects
  • Pressure effects
  • Catalyst effects
  • Le Chatelier's principle

Advanced Topics

Complex cases:

  • Multiple equilibria
  • Activity coefficients
  • Non-ideal solutions
  • Heterogeneous equilibria
  • Temperature dependence

Essential Reaction Quotient Formulas

Reaction Quotient

Q = [Products]ᵃ/[Reactants]ᵇ

where:

  • a, b = stoichiometric coefficients
  • [] = concentrations

Reaction Progress

ξ = Δn/ν

where:

  • Δn = change in moles
  • ν = stoichiometric coefficient

Equilibrium Prediction

x = [-b ± √(b² - 4ac)]/2a

where x is the change in concentration