7.5 Quantitative Changes In Equilibrium

Question 1

Does changing concentration change the equilibrium constant?

Answer 1

No

Question 2

Explain the carbonic acid buffer system to increase blood pH

Answer 2

• CO2 (aq) + H2O (l) <-> H2CO3 (aq) <-> HCO3 + H+
• Administering carbonate ions causes equilibrium to shift left reducing carbonic acid concentration to raise blood pH

Question 3

What is the Reaction Quotient (Q)

Answer 3

The products of concentrations of products divided by product of concentrations of reactants for a reaction not necessarily at equilibrium

Question 4

What are instantaneous concentrations

Answer 4

Concentrations that occur together at a particular time in the progress of a chemical reaction

Question 5

What happens if Q<K

Answer 5

System has too much reactant, rxn shifts right

Question 6

What happens if Q=K

Answer 6

System is at equilibrium

Question 7

What happens if Q>K

Answer 7

System has too much product, rxn shifts left

Question 8

What is the 100 rule

Answer 8

If the initial reactant divided by the value of K is greater than 100, then a change in concentration can be ignored to simplify an equation mathematically

Question 9

What is the 5% rule

Answer 9

If (Initial concentration - Final concentration) / Initial concentration x 100 is between 0 and 5%, using the 100 rule was appropriate