Answers2026-2027_MDCPS_2003345_Chemistry_1_B-CRLab: Measuring pH

Lab: Measuring pH — Unit test Answers

0 verified answers1 views
1
Free Preview

Consider the chemical equation below.Which is the net ionic equation?

Question illustration
A
Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O.
Option A
B
Upper M g superscript 2 plus, plus 2 upper O upper H superscript minus, plus 2 upper H superscript plus right arrow upper M g superscript 2 plus, plus 2 upper H subscript 2 upper O.
Option B
C
Upper M g superscript 2 plus, plus 2 upper N upper O subscript 3 superscript minus right arrow upper M g superscript 2 plus plus 2 upper N upper O subscript 3 superscript minus.
Option C
D
Upper M g superscript 2 plus plus 2 upper O upper H superscript minus plus 2 upper H superscript plus plus 2 upper N upper O subscript 3 superscript minus right arrow upper M g superscript 2 plus, plus 2 upper N upper O subscript 3 superscript minus plus 2 upper H subscript 2 upper o.
Option D
2
Free Preview

A weak base is added to water. Which information is required to find the strength of its conjugate acid?

A
the value of Kb and the concentration of the weak base
B
the value of Kw only
C
the values of Kb and Kw
D
the values of and Kw and the concentration of the weak base
3

Which statement best describes salts?

A
Salts form from hydrogen ions and hydroxide ions in neutralization reactions.
B
Most salts do not dissociate when dissolved in water.
C
Most salts form solutions that are neutral.
D
Solutions of salt and water conduct electricity.
4

What do strong acids and strong bases have in common?

A
They both partially dissociate, with reverse reactions occurring.
B
They both dissociate completely, with little or no reverse reactions.
C
They both remain intact when placed in water, with no dissociation taking place.
D
They both dissociate completely, with reverse reactions constantly taking place.
5

What is the Arrhenius definition of a base?

A
A substance that increases H3O+ concentration when it is dissolved in water.
B
A substance that increases OH– concentration when it is dissolved in water.
C
A compound that donates protons.
D
A compound that accepts protons.
6

A compound accepts electrons from another substance to form a covalent bond. Which term best describes this compound’s behavior?

A
Lewis acid
B
Arrhenius base
C
Bronsted-Lowry acid
D
Bronsted-Lowry base
7

The pH of lemon juice at 298 K is found to be 2.32. What is the concentration of ions in the solution? Use .

Question illustration
A
1.05 times 10 to the negative 3 moles per liter.
Option A
B
4.79 times 10 to the negative 3 moles per liter.
Option B
C
2.09 times 10 squared moles per liter.
Option C
D
9.55 times 10 squared moles per liter.
Option D
8

Which of these equations correctly expresses the self-ionization of water?

A
Upper H subscript 2 upper O superscript plus upper H subscript 3 upper O superscript plus double-headed arrow upper H subscript 2 upper O plus upper O upper H superscript minus.
Option A
B
Upper H subscript 2 upper O plus upper H subscript 2 upper O double-headed arrow 2 upper O upper H superscript minus.
Option B
C
Upper H subscript 2 upper o plus upper H subscript 2 upper O double headed arrow 2 upper H subscript 3 upper O superscript plus.
Option C
D
Upper H subscript 2 upper O plus upper H subscript 2 upper O double-headed arrow upper H subscript 3 upper O superscript plus, plus upper O upper H superscript minus.
Option D
9

The two products that are formed when a solution of HNO3 and a solution of NaOH react are water and

A
NaNO2.
B
NaNO3.
C
NaHNO.
D
NaHNO3.
10

Which salt is produced when NH4OH reacts with HNO3?

A
KNO2
B
NaNO3
C
NH4NO3
D
NH4NO2
11

What is the relationship between Ka and Kb with Kw?

A
The sum of Ka and Kb equals the auto-dissociation constant for water.
B
The product of Ka and Kb equals the auto-dissociation constant for water.
C
The quotient of Ka and Kb equals the auto-dissociation constant for water.
D
The difference of Ka and Kb equals the auto-dissociation constant for water.
12

An acid has an acid dissociation constant of 2.8 10–9. What is the base dissociation constant of its conjugate base? Use .

Question illustration
A
2.8 10–23
Option A
B
3.6 10–6
Option B
C
2.8 105
Option C
D
3.6 1022
Option D
13

Several substances are labeled on the pH scale below.Which substance has the lowest [H+] concentration but is still considered an acid?

Question illustration
A
milk
B
blood
C
gastric fluid
D
household lye
14

Which characteristic best identifies an Arrhenius base?

A
It must donate electrons to form a covalent bond.
B
It must accept protons from an acid.
C
It must generate hydroxide ions in water.
D
It must form a conjugate acid after reacting.
15

An unknown substance turns methyl orange solution red. This shows that the substance

A
is a base.
B
is water.
C
is an acid.
D
is an alkaloid.

Did you find these answers helpful?

More from this Course

Quiz
13 verified answers

Unit Test

Quiz
3 verified answers

Unit Test

Quiz
15 verified answers

Unit Test