Acids and Bases Concepts

The lecture introduces the concept of acids and bases, explaining their ionization in water. It distinguishes between strong and weak acids and bases, using examples like hydrochloric acid and sodium hydroxide. The lecture covers calculating percent ionization for weak acids, using a nitrous acid example. It also discusses how acid strength increases as you move right and down the periodic table. The session concludes with a summary of key points about acid and base strengths.

What is the primary characteristic of an acid?

• It accepts a hydroxide ion.

• It donates a hydrogen ion.

• It accepts a hydrogen ion.

• It donates a hydroxide ion.

Which of the following is a strong base?

• Nitrous acid

• Methane

• Hydrochloric acid

• Sodium hydroxide

What happens to a strong acid in water?

• It does not ionize.

• It completely ionizes.

• It forms a precipitate.

• It partially ionizes.

How do you calculate the percent ionization of a weak acid?

• Multiply the concentration of the acid by the concentration of the hydronium ion and divide by 100.

• Subtract the concentration of the hydronium ion from the concentration of the acid and multiply by 100.

• Divide the concentration of the hydronium ion by the concentration of the acid and multiply by 100.

• Divide the concentration of the acid by the concentration of the hydronium ion and multiply by 100.

What is the percent ionization of a 0.125 molar solution of nitrous acid with a pH of 2.09?

• 100%

• 12.5%

• 6.5%

• 0.81%

Which direction on the periodic table indicates increasing acid strength?

• Up and to the right

• Down and to the right

• Up and to the left

• Down and to the left

Which of the following is neither an acid nor a base?

• Fluorine

• Methane

• Sodium hydroxide

• Hydrochloric acid

What happens to the strength of bases as you move up and to the left on the periodic table?

• It decreases.

• It remains the same.

• It fluctuates.

• It increases.

What does the percent ionization of a weak acid tell you?

• The strength of the base.

• The pH of the solution.

• The amount of weak acid that has been ionized.

• The total amount of acid present.

What is the ionization level of a strong acid in water?

• 100%

• 0%

• 50%

• 75%