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Worksheets

Acids Bases Conjugates

Total questions: 27

Worksheet time: 25mins

Name
Class
Date
1.

Which compound is the conjugate base?

HCO3- + HCl ==> H2CO3 + Cl-

a)

HCO3-

b)

HCl

c)

H2CO3

d)

Cl-

2.

NH3 + H2O --> NH4+ + OH-

What is H2O in this reaction?

a)

acid

b)

base

c)

conjugate acid

d)

conjugate base

3.

In the reaction below, H2O is a(n):

H2SO3 + H2O --> H3O+ + HSO3-

a)

base

b)

acid

c)

conjugate acid

d)

conjugate base

4.
In the reaction HCl + H2O --> H3O+ + Cl-, what is the conjugate acid?
a)
HCl
b)
H2O
c)
H3O+
d)
Cl-
5.

Given the equation:

H2SO4 + H2O ↔ H3O+ + HSO4- 1

What is the conjugate acid?

a)

H2SO4

b)

H2O

c)

H3O+

d)

HSO4- 1

6.
Which of the following is transferred between a conjugate acid-base pair?
a)
An Electron
b)
A OH- ion
c)
A Proton
d)
A Neutron
7.

NH3 + H2O --> NH4+ + OH-

What is OH- in this reaction?

a)

acid

b)

base

c)

conjugate acid

d)

conjugate base

8.

Which of the following show an acid and its conjugate base pair (in that order)

a)

H2SO4, SO42-

b)

OH-, H2O

c)

NH4+, H2O

d)

H2CO3, HCO3-

9.

Which compound is the conjugate acid? (Hint: Determine the base)

PO43- + HNO3 ==> NO3- + HPO42-

a)

PO43-

b)

HNO3

c)

NO3-

d)

HPO42-

10.

In the reaction below, H2O is a(n):

H2SO3 + H2O --> H3O+ + HSO3-

a)

base

b)

acid

c)

conjugate acid

d)

conjugate base

11.
HSO4+ H2 H3O++ SO42-
Identify the Acid in the above reaction.
a)
HSO4-
b)
H2O
c)
H3O+
d)
SO42-
12.
CO32-(aq)+H2O(l)      →              HCO3-(aq)+OH-(aq)
Using the above reaction, which compound is the conjugate base?
a)
CO32-
b)
H2O
c)
HCO3-
d)
OH-
13.

How do Bronsted-Lowry conjugate acid-base pairs differ?

a)

differ by one H+

b)

Differ by one OH-

c)

Differ by two H+

d)

Differ by some number of H+

14.
What is the conjugate acid in the following equation?
a)
PO43- 
b)
HNO3 
c)
NO3- 
d)
HPO42-
15.
What is the conjugate base in the following reaction?
a)
HCO3- 
b)
HCl
c)
 H2CO3 
d)
Cl-
16.

Given the reaction above, which compound is the bronsted-Lowry Acid?

a)

NH3

b)

HCl

c)

NH4+

d)

Cl-

17.

Given the reaction above, which compound is the bronsted-Lowry Conjugate base, if HCl is the acid?

a)

NH3

b)

NH4+

c)

Cl-

18.

Given the information from the previous three questions, what is NH4+ classified as?

a)

Acid

b)

Base

c)

Conjugate Acid

d)

Conjugate Base

19.
Which of the following is a conjugate acid/base pair?
a)
HCl/OCl-
b)
H2SO4/SO42-
c)
NH4+/NH3
d)
H3O+/OH-
20.
Which of the following is the conjugate acid of HCO3-1?
a)
H2CO3
b)
CO3-2
c)
H2CO3-1
d)
CO3-1
21.

Which base has the strongest conjugate acid?

a)

NaOH

b)

NH3

22.

Which base has the strongest conjugate acid?

a)

Mg(OH)2

b)

N2H4

23.

Which base has the weakest conjugate acid?

a)

CH3NH2

b)

Ba(OH)2

24.

Which acid has the strongest conjugate base?

a)

CH3COOH

b)

HCl

25.

Which acid has the weakest Conjugate Base?

a)

HF

b)

HI

26.

Which Conjugate Base is the weakest?

a)

F-

b)

HSO41

27.

Which Conjugate Base is the Strongest?

a)

NH4+

b)

H2SO4