7.3 Le Chatelier Principle

The following factors affect the position of equilibrium EXCEPT

• Concentration
• Pressure
• Temperature
• States of matter

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NGSS.HS-PS1-5

NGSS.HS-PS1-6

Equilibrium for 2CrO₄^2- + 2H⁺ → Cr₂O₇^2- + H₂O. What happen when H⁺ ion are added to the system?

• Position of equilibrium will shift to left
• Color of system will turn from orange to yellow
• K_c will be higher
• Equilibrium will shift to right to decrease the added H⁺ ion

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NGSS.HS-PS1-5

NGSS.HS-PS1-6

Equilibrium for 2CrO₄^2- + 2H⁺→Cr₂O₇^2- + H₂O. What happen when OH^- ions are added to the system?

• Position of equilibrium will shift to right
• Color of system will turn from orange to yellow
• K_c will decrease
• OH^- ions will not react, and thus no change is seen.

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NGSS.HS-PS1-6

For CoCI₄^2- +6H₂O →Co(H₂O)₆²⁺ + 4CI^-. What happen when CI^- ions are added?

• Position of equilibrium will shift to right
• Color of system will turn from blue to pink
• Concentration of reactants and products remain unchanged
• Equilibrium shift to left to reduce the added CI^- ions

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NGSS.HS-PS1-5

NGSS.HS-PS1-6

For CoCI₄^2- +6H₂O →Co(H₂O)₆²⁺ + 4CI^-. What happen when H₂O ions are added?

• Position of equilibrium will shift to left
• Color of system will turn from blue to pink
• K_c will change and increase as H₂O is added
• Equilibrium shift to left to reduce the added H₂O

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

For N₂O₄ (colorless) → 2NO₂ (brown). What happens when pressure is increased?

• Position of equilibrium will shift to right
• Color of system will turn from colorless to brown
• K_c will not change
• Position of equilibrium will not change

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NGSS.HS-PS1-6

For N₂O₄ (colorless)→ 2NO₂ (brown). By reducing pressure, equilibrium is shift to right. WHY?

• Shift to the right will increase the rate of reaction
• Color of system will turn from colorless to brown.
• More particles on the right, so K_c will increase
• More particles on the right, so pressure can increase again

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NGSS.HS-PS1-6

For N₂ + 3H₂ →2NH₃ . When pressure is increased the equilibrium shift to right. Why?

• To increase the amount of products
• To reduce the pressure, as right has less number of molecule
• K_c will increase when it is shifted to the right
• So it will increase the rate of reaction

Tags

NGSS.HS-PS1-6

CoCI₄^2- +6H₂O →Co(H₂O)₆²⁺ + 4CI^- (ΔH = -ve) What will happen when temperature is increased?

• Position of equilibrium will shift to left
• Position of equilibrium will shift to right
• No change in position of equilibrium
• Equlibrium will not be affected

Tags

NGSS.HS-PS1-5

For N₂O₄ → NO₂ (ΔH = +ve). What will happen when temperature is increased?

• Position of equilibrium will shift to left
• Position of equilibrium will shift to right
• No change in position of equilibrium
• Equlibrium will not be affected

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6