Experiment 5 Sample Quiz

1. In this experiment you will monitor the changes that occur in pH as you titrate:
a weak polyprotic acid with a weak base.
a strong acid with a weak base.
a weak polyprotic acid with a strong base.
a strong acid with a strong base.

2. When the following reaction is balanced the coefficients in front of the reactants and products are:
H2X(aq) + NaOH = Na2X(aq) + H2O(l)

1,1,1,1
1,2,1,2
2,1,2,1
1,2,2,1

3. The approximate molarity of the phosphoric acid used in this experiment is:
2M
0.00002M
0.2M
0.02M

4. The image depicted in the introduction is for:
an idealized mono-prototic acid.
an idealized di-protic acid.
citric acid.
phosphoric acid.
an idealized tri-protic acid.

5. The experiment calls for the use of which of the following indicators?
Phenolphthalein
Universal
Methyl-orange
No indicator is used in this experiment

6. The titration is considered complete when the pH reaches?
7
1
14
12

7. The exact molarity of the phosphoric acid used in this experiment is:
0.02M
0.2M
2M
to be determined in the experiment.

8. What is special about the [H3O+] at the 1/2 equivalence point in the titration of a weak mono-protic acid with a strong base?
[H3O+] = Ka
[H3O+] = molarity of the acid
[H3O+] = [OH-]
[H3O+] = Kb

9. The procedure calls for the addition of __mL of acid to a small beaker?
10
20
100
50

10. The procedure calls for plotting a graph of '_________' versus '______________" added.
'pH' Vs 'Volume of base added'.
'pH' Vs 'Volume of acid added'.
'[H3O+]' Vs 'Volume of acid added'.
'[H3O+]' Vs 'Volume of base added'

11. How many Ka values do you expect to be able to determine for citric acid?:
1
5
2
3
4

12. The initial buret reading corresponds to:
the volume of acid added.
0.00mL of base added.
the volume of base added.
0.00mL of acid added.