Understanding Graphs and pH Levels

If 25.0 mL of HCl is titrated with 30.0 mL of 0.100 M NaOH, what is the molarity of the HCl solution?

• 0.120 M

• 0.100 M

• 0.150 M

• 0.200 M

Why is it essential that a chemical equilibrium system be closed?

• To prevent the system from reaching equilibrium

• To maintain constant concentrations of reactants and products

• To allow external factors to influence the equilibrium

• To ensure the reaction stops completely

What does "equilibrium" mean in the context of chemical reactions?

• The concentrations of reactants and products are constantly changing.

• The concentrations of reactants and products stay constant.

• Reactants are completely converted into products.

• Products are completely converted into reactants.

What does "physical equilibrium" involve?

• Phase changes with no change in chemical identity.

• Breaking and forming chemical bonds.

• Complete conversion of reactants into products.

• Reactions that only occur in open systems.

What happens when the forward and reverse reactions occur at the same rate in a system?

• The system becomes unstable

• The system remains stable but changes continue to occur

• The system stops all activity

• The system accelerates its activity

Why does the equilibrium point appear differently on a concentration–time graph compared to a rate of reaction graph, in terms of the shapes of the forward and reverse reaction curves?

• The equilibrium point is the same on both graphs, but the curves are inverted.

• The concentration–time graph shows the equilibrium as a plateau, while the rate of reaction graph shows it as intersecting curves.

• The equilibrium point is not visible on either graph.

• The concentration–time graph shows the equilibrium as intersecting curves, while the rate of reaction graph shows it as a plateau.

What happens to the concentration of reactants and products at equilibrium?

• The concentration of reactants decreases while the concentration of products increases.

• The concentration of reactants and products remains constant.

• The concentration of reactants increases while the concentration of products decreases.

• The concentration of reactants and products fluctuates continuously.

Explain why a reaction moves toward products when the forward reaction rate is higher.

Determine the type of titration shown in the graph and justify your answer.