Reaction Quotient Calculator - Calculator Suite

Reaction Quotient (Qc)

Chemical Reaction:

Current Product Concentrations (M):

Product Stoichiometric Coefficients:

Current Reactant Concentrations (M):

Reactant Stoichiometric Coefficients:

Equilibrium Constant (Kc):

Gas Phase Reaction Quotient (Qp)

Gas Reaction:

Current Product Pressures (atm):

Product Coefficients:

Current Reactant Pressures (atm):

Reactant Coefficients:

Equilibrium Constant (Kp):

Time-Based Q Analysis

Initial Product Concentration:

Initial Reactant Concentration:

Time Intervals (minutes):

Product Concentrations at Each Time:

Kc Value:

Common Reactions Database

Select Reaction:

Reaction Quotient Reference Guide

Key Concept:

Q = [Products]^coefficients / [Reactants]^coefficients

Q has the same form as K, but uses current concentrations instead of equilibrium values

Reaction Direction Prediction:

Q < K:

Forward Reaction

Not enough products. Reaction proceeds right (→) to make more products.

Q = K:

At Equilibrium

System is balanced. No net reaction occurs.

Q > K:

Reverse Reaction

Too many products. Reaction proceeds left (←) to make more reactants.

Practical Applications:

Industrial processes: Optimize reaction conditions for maximum yield
Environmental chemistry: Predict pollutant behavior in natural systems
Biochemistry: Understand metabolic pathway directions
Analytical chemistry: Design separation and purification methods

Important Notes:

Q and K have the same mathematical form but different meanings
Pure solids and liquids are excluded from Q calculations
Q changes as reaction proceeds until Q = K at equilibrium
Temperature affects K but not the Q calculation method

⚖️ Reaction Quotient Calculator