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:
H
2
X(aq) + NaOH = Na
2
X(aq) + H
2
O(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 [H
3
O
+
] at the 1/2 equivalence point in the titration of a weak mono-protic acid with a strong base?
[H
3
O
+
] = K
a
[H
3
O
+
] = molarity of the acid
[H
3
O
+
] = [OH
-
]
[H
3
O
+
] = K
b
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'.
'[H
3
O
+
]' Vs 'Volume of acid added'.
'[H
3
O
+
]' 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.
