1 / 8

Reaction Quotient

Reaction Quotient. Chem 12. More about equilibrium:. We’ve been looking at systems that reach equilibrium! What if a reaction has not yet reached equilibrium? How can you predict the direction in which the reaction must proceed to reach equilibrium? We use the reaction quotient!.

lisbet
Download Presentation

Reaction Quotient

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Reaction Quotient Chem 12

  2. More about equilibrium: • We’ve been looking at systems that reach equilibrium! • What if a reaction has not yet reached equilibrium? • How can you predict the direction in which the reaction must proceed to reach equilibrium? • We use the reaction quotient!

  3. Reaction Quotient (Qc): • What does this look like? • ……. Kc or Keq • Used same way as Kc (or Keq) but uses concentrations not at equilibrium

  4. The Relationship Between the Equilibrium Constant: • Qc > Kc: Reaction move right to left (from products to reactants) • Qc < Kc: Reaction move left to right (from reactants to products) • What if Qc = Kc ? • Then system is at equilibrium!

  5. Think mathematically….

  6. Example: • Calculate the Qc for the following reaction if these concentrations are present: [N2] = 0.10 M, [H2] = 0.30 M and [NH3] = 0.20 M. • Is the system at equilibrium if Kc of the reaction is 0.40? N2 + 3H2 < -- >2NH3

  7. Example cont’d… N2 + 3H2 < -- >2NH3 1. Calculate Qc: Qc = [NH3]2= [0.20]2_______ [N2][H2]3 [0.10][0.30]3 Qc = 14.8 2. Compare Qc to Kc: 14.8 > 0.4 Qc > Kc (reaction shifts right to left (P to R)

  8. Try it: • Page 519 # 30, 31

More Related