Answers2026-2027_MDCPS_2003345_Chemistry_1_B-CRLab: Measuring pH

Lab: Measuring pH — Unit test Answers

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1
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Lewis acids and bases are most closely associated with which process?

A
proton transfer
B
electron transfer
C
the formation of aqueous ions
D
the formation of a conjugate acid or base
2
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Which of these correctly defines the pOH of a solution?

A
the log of the hydronium ion concentration
B
the negative log of the hydronium ion concentration
C
the log of the hydroxide ion concentration
D
the negative log of the hydroxide ion concentration
3

A strong acid, HA, is added to water. Which statement about the solution is true?

A
It contains mostly hydroxide ions.
B
It contains almost no hydronium ions.
C
It contains little or no HA.
D
It contains a low amount of ions.
4

A solution of HCl has = 0.01 M. What is the pH of this solution?Use .

Question illustration
A
–2
B
–1
C
1
D
2
5

The table below lists some acids and bases.Strong acidsWeak acidsWeak basesStrong basesHBrCH3COOHNH3NaOHHNO3HCOOHNH4OHKOHH2SO4 Ca(OH)2Which reaction yields a salt that has a pH < 7?

A
mc013-1.jpg
Option A
B
mc013-2.jpg
Option B
C
mc013-3.jpg
Option C
D
mc013-4.jpg
Option D
6

An unknown substance turns blue litmus paper to red. Which additional test could be used to confirm the substance’s identity?

A
It should turn phenolphthalein from colorless to pink because it is a base.
B
It should turn phenolphthalein from pink to colorless because it is a base.
C
It should turn methyl orange to orange because it is an acid.
D
It should turn methyl orange to red because it is an acid.
7

What type of substance reacts with limestone (CaCO3) and produces carbon dioxide gas?

A
a neutral substance
B
a base
C
an acid
D
both an acid and a base
8

What is the definition of a Lewis base?

A
a substance that donates a proton
B
a substance that donates electrons to form a covalent bond
C
a substance that accepts electrons to form a covalent bond
D
a substance that when dissolved in water increases hydrogen ion concentration
9

Which of the following is the correctly balanced chemical equation for the reaction of Ca(OH)2 and HNO3?

A
Upper C a (upper O upper H) subscript 2 plus upper H upper N upper O subscript 3 right arrow upper C a superscript 2 plus, plus upper N upper O subscript 3 superscript minus.
Option A
B
Upper C a (upper O upper H) subscript 2 plus 2 upper H upper N upper O subscript 3 right arrow 2 upper H subscript 2 upper O plus 2 upper N upper O subscript 3 superscript minus
Option B
C
Upper C a (upper O upper H) subscript 2 plus upper H upper N upper O subscript 3 right arrow upper H subscript 2 upper O plus upper C a upper N upper O subscript 3.
Option C
D
Upper C a (upper O upper H) subscript 2 plus 2 upper H upper N upper O subscript 3 right arrow 2 upper H subscript 2 upper O plus UPper C a (upper N upper O subscript 3) subscript 2.
Option D
10

Which of these refers to the strength of an acid?

A
a measure of the quantity of acid dissolved in water designated by molarity
B
an intrinsic characteristic of a particular acid, not related to concentration
C
the amount of hydrogen ions present in the acid
D
the amount of hydroxide ions present in a solution
11

A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution?Useful formulas include , , , and .

Question illustration
A
1.58 10–12 M
Option A
B
6.31 10–3 M
Option B
C
2.20 M
D
158 M
12

A salt is best described as a compound that is formed from the reaction between

A
an acid and a base.
B
a strong acid and a weak acid.
C
a strong base and a weak base.
D
an acid and water.
13

Which of the following substances is an Arrhenius acid?

A
BF3
B
HCN
C
NH3
D
Mg(OH)2
14

Look at the diagram showing hydrochloric acid being added to water. Which statement best explains what is taking place?

Question illustration
A
A strong acid is disassociated completely, producing more conjugate base.
B
A strong base is disassociated completely, producing more conjugate acid.
C
Hydrogen is combining with chlorine to form more acid.
D
Hydrogen is combining with chlorine to form a strong base.
15

What does it mean for a strong base to be in equilibrium?

A
The position of equilibrium lies far to the right, with products being favored.
B
The position of equilibrium lies far to the left, with products being favored.
C
There is a great deal of base and very few ions.
D
There is an equal amount of reactants and products.
16

Which description correctly characterizes the acidity or basicity of a solution?

A
The higher the pH is, the more the hydroxide ion concentration decreases and the more acidic the solution becomes.
B
The higher the pH is, the more the hydroxide ion concentration increases and the more basic the solution becomes.
C
The lower the pH is, the more the hydronium ion concentration decreases and the more acidic the solution becomes.
D
The lower the pH is, the more the hydronium ion concentration increases and the more basic the solution becomes.
17

Soaps feel slippery on our hands because they dissolve the oil on our skin, decreasing friction.This is because soap contains

A
a neutral molecule.
B
a salt molecule.
C
an acid.
D
a base.
18

Consider the reaction below.Which is the net ionic equation for the reaction?

Question illustration
A
Upper H superscript plus, plus upper C l superscript minus right arrow upper H upper C l.
Option A
B
Upper N a superscript plus, plus upper C l superscript minus right arrow upper N a upper C l.
Option B
C
Upper N a superscript plus, plus upper C subscript 2 upper H subscript 3 upper o subscript 2 superscript minus (a q) plus upper H superscript plus, right arrow upper N a upper C subscript 2 upper H subscript 3 upper O subscript 2.
Option C
D
Upper C subscript 2 upper h subscript 3 upper O subscript 2 superscript minus (a q) plus upper H superscript plus right arrow upper H upper C subscript 2 upper H subscript 3 upper O subscript 2.
Option D
19

Which pair of substances would most likely result in the production of a gas when reacting with an acid?

A
litmus and methyl orange
B
base and salt
C
metal and carbonate
D
carbon dioxide and water
20

Consider the reaction below.NH4+ + H2O NH3 + H3O+Which is an acid-conjugate base pair?

Question illustration
A
NH4+ and NH3
B
NH4+ and H3O+
C
H2O and NH3
D
H2O and H3O+

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