Equilibrium 5

Question 1

Why can’t equilibrium be attained from an open vessel?

Answer 1

It may be noted that equilibrium cannot be obtained if the process is carried out in an open vessel. This is obvious because in an open vessel, the reverse process that is condensation of big bus back to Water will not take place.

Question 2

Define equilibrium vapor pressure

Answer 2

The pressure exerted by vapors is in equilibrium with the liquid at a particular temperature is called equilibrium, vapor pressure of vapor pressure of the liquid

Question 3

Define reversible reactions

Answer 3

Reversible reactions are the reactions in which the products formed can also react with one another under suitable conditions to give back the reactants.

Question 4

Define irreversible reactions

Answer 4

The chemical reactions in which the product form do not combine to give back. The reactants are known as irreversible reaction.

Question 5

Characteristics of equilibrium, constant

Answer 5

1. Equilibrium constant is applicable only when the concentration of reactants and products have attained equilibrium state.
2. The equilibrium constant has a definite value for every reaction at a particular temperature.
3. For a reversible reaction the equilibrium constant for the forward reaction is inverse of the equilibrium constant for the backward reaction.
4. The equilibrium constant is independent of the presence of catalyst.

Question 6

Applications of Le Chatelier‘s principle of physical equilibrium

Answer 6

1. Dissolution of ammonium chloride in water
2. Dissolution of sodium hydroxide in water
3. Solubility of gas and liquid

Question 7

What happens to an equilibrium in a reversible reaction if a catalyst is added to it

Answer 7

When a catalyst is added, the state of equilibrium is not disturb, but equilibrium is attained quickly. This is because the catalyst increases the rate of forward and backward reaction to the same extent extent.

Question 8

What does the equilibrium constant K less than one indicate?

Answer 8

This indicates that the reaction does not proceed much in the forward direction

Question 9

Explain why pure solids and liquids are ignored while writing, the equilibrium, constant expression.

Answer 9

For the concentration of pure solid or pure liquid
[ Solid] or [ liquid] =no. Of moles/volume in L.
= Mass/molar mass / volume
= mass/volume x 1/molar mass
= Density x 1/molar mass
Since density of pure, solid or liquid is constant at a constant temperature, and the molar mass is also constant. Therefore, the molar concentrations are constant and included in the equilibrium constant.