Acid-Base Chemistry Concepts

The video tutorial covers weak acids and percent dissociation, starting with a review of strong acids and pH calculations. It introduces percent dissociation as a measure of acid strength, explaining how to calculate it using equilibrium concentrations. The tutorial also demonstrates reverse calculations to find Ka and percent dissociation from a given pH. It explores the common ion effect in acid-base reactions and discusses the behavior of very dilute acid solutions, emphasizing the importance of concentration in determining pH.

What is the pH of a 2.0 M solution of nitric acid?

• 1.0

• 3.0

• 0.3

• 2.0

If the pH of NaOH is 12.5, what is the concentration of NaOH?

• 0.03 M

• 0.3 M

• 0.003 M

• 3.0 M

What does percent dissociation measure in an acid?

• The strength of the base

• The pH of the solution

• The amount of acid that dissociates compared to the total amount

• The total concentration of the acid

Given a 0.10 M HA with a Ka of 1.8 x 10^-5, what is the percent dissociation?

• 3.1%

• 1.3%

• 0.13%

• 13%

How can you find the Ka if the pH and concentration of a solution are given?

• By directly using the pH value

• By using the concentration of the base

• By using the pH to find H+ concentration and then calculating Ka

• By measuring the temperature

What happens to the equilibrium when a common ion is added to a solution?

• It becomes neutral

• It shifts to the right

• It remains unchanged

• It shifts to the left

In a common ion problem, what is the initial concentration of H+ if 0.001 moles of HCl is added to 1 liter of water?

• 1.0 M

• 0.1 M

• 0.01 M

• 0.001 M

What is the pH of a solution when a strong acid is extremely diluted?

• It becomes acidic

• It remains neutral

• It becomes more concentrated

• It becomes basic

Why might a strong acid solution have a pH of 7 when diluted?

• The acid completely dissociates

• The concentration is less than that of pure water

• The acid reacts with the container

• The temperature is too high

What should you check if a calculated pH seems incorrect for an acid or base?

• The volume of the solution

• The temperature of the solution

• The concentration of the solution

• The color of the solution