Sample Quizzes are designed to give you an idea of the types of questions you can expect.  Quiz numbers may not exactly agree with currently assigned material, so you may need to examine several quizzes to see the ones that cover the material we are now covering.

Quiz #10

1. Acids and bases exist as acid-base conjugate pairs. For each of the following bases, write the conjugate acid:

NO₃^- _____________________

HS^- _____________________

Cl^- _____________________

HSO₃^- _____________________

Now, write the conjugate base for each of the following:

NH₄⁺ _____________________

H₂O _____________________

2. Water is a weak acid, meaning that it ionizes poorly. If you have a container of pure water, what is the concentration of the H⁺ and OH^- ions? If you have a H⁺ concentration of 10^-4 M, what is the pH? What is [H⁺] if pH = 7.5?

3. What is the Bronsted-Lowry definition for an acid and a base? Explain why, using this definition, that ammonia NH₃ is a base.

4. You have 125 mL of hydrochloric acid and neutralize it with 135 mL of 0.225 M NaOH. From these data, what is the molarity of acid? Using the volume and molarity of the NaOH, how many moles of NaOH were used?

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