Pure solid addition - Equilibrium

The video explains that solid reactants or products do not affect chemical equilibrium. Using the dissociation of calcium carbonate as an example, it shows that adding or removing solids like calcium carbonate or calcium oxide does not disturb equilibrium. The QC value, which equals KC in equilibrium reactions, is independent of solid concentrations, as these are considered unity and excluded from the QC expression. Thus, the position of equilibrium remains unaffected by changes in the amount of solid components.

What is the effect of adding solid calcium carbonate to an equilibrium reaction mixture?

• It shifts the equilibrium to the right.

• It shifts the equilibrium to the left.

• It increases the concentration of gaseous products.

• It has no effect on the equilibrium.

In the context of equilibrium reactions, what is the QC value?

• The ratio of the concentration of products to reactants.

• The concentration of solid reactants.

• The equilibrium constant for solids.

• The concentration of gaseous products.

Why are the concentrations of solid calcium carbonate and calcium oxide considered unity in QC expressions?

• Because their concentrations do not change.

• Because they are not part of the reaction.

• Because they are in excess.

• Because they are liquids.

What conclusion can be drawn about the addition or removal of solids in an equilibrium reaction?

• It does not influence the chemical equilibrium.

• It increases the reaction rate.

• It affects the concentration of gases.

• It changes the equilibrium constant.

Which of the following is true about QC in relation to solids?

• QC is only affected by liquid concentrations.

• QC is independent of the concentration of solids.

• QC changes with the addition of solids.

• QC is dependent on the concentration of solids.