ch. 9 end

ch. 9 end - L16 Mass Action Law Equilibrium constant aA bB...

This preview shows pages 1–6. Sign up to view the full content.

L16: Mass Action Law: Equilibrium constant - gases: enter as pressure, in atm or torr - dissolved species: enter as concentration, M - pure solids/liquids: do not appear in equations, including solvents which take part in chemical rxn (provided the solutions are dilute) b a d c B A D C K ] [ ] [ ] [ ] [ = b B a A d D c C P P P P K = dD cC bB aA + + Today: 1. Reaction Quotient and equilibrium problems 2. Le Chatelier Principle

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Reaction quotient and direction of rxns not at equilibrium b a d c B A D C Q ] [ ] [ ] [ ] [ = b B a A d D c C P P P P Q = dD cC bB aA + + Concentrations and pressures – CURRENT values Q=K: rxn at equilibrium, no changes in concentrations Q<K : rxn goes forward (to products) Q>K: rxn goes backward (to reactants)
3 2 1 2 2 3 H N NH P P P Q = N 2 + 3H 2 Æ 2NH 3 b B a A d D c C P P P P Q = Many sets of pressures of reactants And products can give K

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
H 2 +I 2 2HI K=54 (at 700 K) 1. Start P H2 =P I2 =1 atm, P HI =0 atm: Q=0, rxn goes forward @ equilibrium: P HI =1.57 atm, P I2 =P H2 =0.21 atm 2. Start P H2 =P I2 =0 atm, P HI =2 atm Q=infinity, rxn goes backward @ equilibrium: P HI =1.57 atm, P I2 =P H2 =0.21 atm 3. Start P H2 =P I2 =P HI =1 atm Q=1, rxn goes forward @ equilibrium: P HI =1.36 atm, P I2 =P H2 =0.32 atm Equilibrium simulator http://chemmac1.usc.edu/equilibrium/equilibrium.php 2 2 2 I H HI P P P Q = Equilibrium simulator
Phosgene, COCl 2 , is produced from CO and Cl 2 CO(g) + Cl 2 (g) <-> COCl 2 (g) A gas mixture of CO and Cl 2 is prepared that has initial partial pressures

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 17

ch. 9 end - L16 Mass Action Law Equilibrium constant aA bB...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online