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Worksheets8.4 Buffer
Total questions: 18
Worksheet time: 25mins
Name
Class
Date
1.
Buffer is defined as
a)
ability to resist pH change
b)
ability to prevent pH from decreasing
c)
ability to resist a pH increase
d)
ability to resist pH change when small amount of acid added
2.
Acidic buffer is made up of
a)
weak acid and weak base
b)
weak acid and its conjugate salt
c)
weak acid and its conjugate base
d)
strong acid and its conjugate base
3.
Basic buffer is made up of
a)
weak base and weak acid
b)
weak base and its conjugate salt
c)
weak base and its conjugate acid
d)
strong base and its conjugate acid
4.
Which solution A and B of equal volume and concentration mixed together to form a buffer?
a)
Nitric acid and potassium hydroxide
b)
Nitric acid and potassium nitrate
c)
Propanoic acid and potassium hydroxide
d)
Propanoic acid and potassium propanoate
5.
Which combination will form a buffer solution?
a)
100ml of 0.1M HCI with 50ml of 0.1M NaOH
b)
100ml of 0.1M CH3COOH with 50ml of 0.1M NaOH
c)
50ml of 0.1M HCI with 100ml of 0.1M NaOH
d)
50ml of 0.1M CH3COOH with 100ml of 0.1M NaOH
6.
Which of the following could be added to a solution of ethanoic acid to prepare a buffer?
a)
NaOH
b)
HCI
c)
NaCI
d)
More ethanoic acid
7.
Which mixtures act as buffer solutions?
a)
I and II
b)
I and III
c)
II and III
d)
I, II and III
8.
Which solutions have a pH less than 7?
a)
I and II
b)
I and III
c)
II and III
d)
I, II and III
9.
Which mixtures could act as buffers?
a)
I and II
b)
I and III
c)
II and III
d)
I, II and III
10.
Which of the following pair is correct?
a)
(FeCI3 - acidic) (Na2CO3 - basic)
b)
(FeCI3 - neutral) (Na2CO3 - basic)
c)
(FeCI3 - acidic) (Na2CO3 - neutral)
d)
(FeCI3 - neutral) (Na2CO3 - neutral)
11.
Which mixture of acid and alkali would produce a buffer solution?
a)
A
b)
B
c)
C
d)
D
12.
Na2CO3 forms alkaline solution when dissolve in water. WHY?
a)
cause water hydrolysis to produce OH-
b)
CO32- ions reacts with H+ from water to produce HCO3-
c)
Na2CO3 dissociates completely to produce CO32- ions
d)
CO32- ions react with water to produce carbonic acid
13.
Which will produce an acidic salt?
a)
A
b)
B
c)
C
d)
D
14.
Which will produce an alkaline salt?
a)
A
b)
B
c)
C
d)
D
15.
NH4CI is an acidic salt. WHY?
a)
It undergo water hydrolysis to produce OH- ions
b)
It undergo water hydrolysis to produce H+ ions
c)
NH4+ is a strong conjugate acid, losing H+ ions to water
d)
NH4+ is a strong conjugate base, gain H+ ions from water
16.
Which combination of salts is correct?
a)
(NH4NO3 - acidic) (Na2CO3 - basic) (CH3COONa - basic)
b)
(NH4NO3 - neutral) (Na2CO3 - basic) (CH3COONa - basic)
c)
(NH4NO3 - neutral) (Na2CO3 - basic) (CH3COONa - acidic)
d)
(NH4NO3 - neutral) (Na2CO3 - neutral) (CH3COONa - acidic)
17.
How a basic salt of CH3COOLi can be prepared?
a)
CH3COOH + Li
b)
CH3COOH + LiNO3
c)
CH3COOH + LiOH
d)
CH3COO- + Li+
18.
The salt shown below is
a)
Acidic
b)
Basic
c)
Neutral
d)
None of the above
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