Experiment 6 - Acid-Base

Question 1

Which might be the label on Beaker C?

Answer 1

Letter C

Question 2

Which beaker would have the lowest pH? A B C D

Answer 2

D. Because it shows the highest concentration of H3O+ and there is no presence of the acid which shows that it dissociates completely

Question 3

You have two beakers. One beaker contains 100mL of NaOH (a strong base); the other
contains 100mL of aqueous Na3PO4

(a weak base). You test the pH of each solution.

Which of the following statements is true?

a. The Na3PO4 has a higher pH because it has more sodium ions than NaOH.

b. It is possible for the solutions in each beaker to have the same pH.

c. If the pH of the NaOH solution is12.00, the pH of the Na3PO4 solution has to be
greater than 12.00.

d. If the pH of the NaOH solution is 12.00, the pH of the Na3PO4 solution has to be less
than 12.00.

Answer 3

D. The Ph of the weak base is less than the strong base. Strong bases ionize completely while weak bases only partially do so.

Question 4

For an acid, what happens to the molecule when it is in a water solution?

Answer 4

an acid dissociates into hydrogen ions (H+) and anions

Question 5

What is different about what happens to a weak acid molecule and what happens to a
strong acid molecule?

Answer 5

Strong acids and strong bases refer to species that completely dissociate to form ions in solution.

By contrast, weak acids and bases ionize only partially, and the ionization reaction is reversible

Question 6

How do the representations of a weak acid reaction differ from a strong one?

Answer 6

Strong acids ionize completely in aqueous solutions while weak acids release a few ions in aqueous solutions

Question 7

If you increase the concentration of an acid, what changes in both types of acids?

Answer 7

If you increase the concentration of an acid, the pH will decrease. For strong acids, the pH will decrease more than weak acids.