Calculating the Equilibrium Constant K eq

Question 1

What is the only factor that can change the Keq value?

Answer 1

Temperature

Question 2

In an exothermic reaction, and in an increase of temp, will the Keq decreases or increase?

Answer 2

Decrease in Keq

Question 3

In an exothermic reaction, and in an decrease of temp, will the Keq decreases or increase?

Answer 3

Increase in Keq

Question 4

In an endothermic reaction, and in an increase of temp, will the Keq decreases or increase?

Answer 4

Increase in Keq

Question 5

In an exothermic reaction, and in an decrease of temp, will the Keq decreases or increase?

Answer 5

Decrease in Keq

Question 6

Large Keq value

Answer 6

The equilibrium position lies significantly to the side of the products (i.e. to the right)

Question 7

Medium Keq value (0.1 and 10)

Answer 7

These are comparable amounts of both reactants and products, so the equilibrium exists as an intermediate mixture

Question 8

Small Keq value

Answer 8

The equilibrium position lies significantly to the side of the reactants (left)

Question 9

What is the equilibrium constant, Keq?

Answer 9

Describes the quantiative relationships/ ratios between the conc. of reactants and products at equilibrium

Question 10

What is the reaction quotient, Q?

Answer 10

Obtained when the conc. of reactants and products for a reaction are not yet at equilibrium

Question 11

Q < K

Answer 11

Lies to the right - increase conc. of products

Question 12

Q = K

Answer 12

System is at equilibrium

Question 13

Q > K

Answer 13

System lies to the left - increase conc. of reactants

Question 14

When pressure, volume or concentrations are changed,…..

Answer 14

they will still satisfy the old Keq value

Question 15

How to calculate the molar solubility of a substance

Answer 15

1. Chemical equation
2. Ksp = ______ - [ ] [ ]
3. Let x = ___, stochiometry
4. Solubility - conc. x Molar mass = g/L