Answers2026-2027_MDCPS_2003345_Chemistry_1_B-CRLab: Measuring pH

Lab: Measuring pH — Unit test Answers

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A substance is dissolved in water and produces hydronium ions. This occurs when hydrogen ions move from the substance to associate with water molecules. Which term best matches the behavior of this substance?

A
Arrhenius base
B
Arrhenius acid
C
Bronsted-Lowry base
D
Bronsted-Lowry acid
2
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How does litmus paper identify a base?

A
A base turns red litmus blue.
B
A base turns blue litmus red.
C
A base turns orange litmus red.
D
A base turns yellow litmus blue.
3

Why is citric acid added to food?

A
to add color
B
to add tartness
C
to add bitterness
D
to add sweetness
4

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.
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

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
7

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
8

An acid is a substance that increases the concentration of H3O+ ions in solution. Look at the reaction below of phenol (C6H5OH) with water:Which reactant acts as an acid by contributing a H+ ion to create H3O+ in the chemical equation?

Question illustration
A
C6H5OH(aq)
B
H2O(l)
C
C6H5O–(aq)
D
H3O+(aq)
9

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.
10

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
12

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 salt is produced when NH4OH reacts with HNO3?

A
KNO2
B
NaNO3
C
NH4NO3
D
NH4NO2
15

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

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