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Understanding Keq and Q in Reversible Reactions: A Comprehensive Guide

This guide explains how to utilize the equilibrium constant (Keq) and the reaction quotient (Q) to analyze reversible reactions. Learn the definitions and applications of Keq and Q, including when to use them to determine the direction of a reaction. Detailed steps for calculating Keq and Q are provided, along with clear examples. The relationship between concentrations of reactants and products at equilibrium and before reaching equilibrium is illuminated, aiding in understanding dynamic chemical processes.

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Understanding Keq and Q in Reversible Reactions: A Comprehensive Guide

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  1. You use Keq to find the concentration of a reversible reaction at equilibrium. You use Q to find the concentration of a reversible reaction at a given time before equilibrium to know in which direction the reaction goes. When do you use this?

  2. What are the definitions? • Keq: Law of mass action express the relative concentration of reactants and products at equilibrium in terms of quantity called the equilibrium constant • Q: The reaction Quotient of Keq

  3. Steps/Rules • Keq: 1. Balance the equation 2.Put the products on top and the reactants on the bottom 3.coefficients are exponents 4.only use (g) and (aq) 5. Use the M of reactants and products to find keq. Keq>>1= reaction lies to the right Keq<<1= reaction lies to the left Keq=1 at equilibrium

  4. More Steps and Rules Q: 1. Do all for Keq 2.Use given M at given temperature. 3.Compare with value of Keq. Q<Keq= reaction lies to the right (product side) Q>Keq= reaction lies to the left (reactant side)

  5. A solved EXAMPLE (Keq) 2CO(g) + O2 (g) ↔ 2CO2 (g) Keq = [CO2]^2/ [CO]^2 [O2] (Q) COCL2(g) ↔ CO(g) Cl2(g) and Keq =170. If the concentration of CO and C2 are each 0.15M and the concentration of COCL2 is 1.1 x 10^-3 is the reaction at equilibrium? [CO][Cl2] / [COCl2] = (.15)(.15)/1.1x10^-3 = 20 Q=20

  6. Here's Something to SOLVE >:) Keq: NH4NO3 (s) ↔ N2O(g) + H2O Q: At 448 degrees C K= 50.5 for the reaction H2(g) + I2(g) ↔ 2HI (g), Find Q and the direction of the reaction of the reaction if [H2] = .15 M, [I2] = .175 M, [HI] = .950 M.

  7. Here are the answers @_@ • Keq = [N2O][H20]^2 • Q= 34.4. Reaction lies to the right.

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