Regents Review
1. According to the Arrhenius theory, an acid is a
substance that:
A) Changes litmus from red to blue
B) Changes phenolphthalein from colorless to pink
C) Produces hydronium ions as the only positive ions
in an aqueous solution
D) Produces hydroxide ions as the only negative ions
in an aqueous solution
 Correct Answer: Option C - Produces hydronium
ions as the only positive ions in an aqueous
solution
1. An acidic solution could have a pH of:
A)
B)
C)
D)
3.5
7
10
14
 Correct Answer: Option A - 3.5
11. Some alternate acid base theories define an acid as
any species that can:
A) Donate an electron
B) Donate a proton
C) Accept a proton
D) Accept an electron
 Correct Answer: Option B - Donate a proton
 In the Brønsted-Lowry theory is an acid-base theory in
which, an acid is defined as any chemical species that is
able to lose, or "donate" a hydrogen ion (proton), and a
base is a species with the ability to gain or "accept" a
hydrogen ion (proton).
12. When HCl(aq) is exactly neutralized by KOH(aq), the
hydrogen ion concentration in the resulting mixture
is:
A) Always equal to the concentration of the hydroxide ions
B) Sometimes greater and sometimes less than the
concentration of the hydroxide ions
C) Always less than the concentration of the hydroxide ions
D) Always greater than the concentration of the hydroxide
ions
 Correct Answer: Option A - Always equal to the
concentration of the hydroxide ions
 Neutralization is a chemical reaction whereby an acid and
a base react to form water and a salt.
16. A student wishes to prepare approximately 100 milliliters
of an aqueous solution of 6M HCl using 12 M HCl. Which
procedure is correct?
A) Adding 50 mL of water to 50 mL of 12 M HCl while stirring the
mixture steadily.
B) Adding 50 mL of 12 M HCl to 50 mL of water and then stirring
the mixture steadily.
C) Adding 50 mL of 12 M HCl to 50 mL of water while stirring the
mixture steadily.
D) Adding 50 mL of water to 50 mL of 12 M HCl and then stirring
the mixture steadily.
 Correct Answer: Option C - Adding 50 mL of 12 M HCl to 50
mL of water while stirring the mixture steadily.
 Adding acid to water prevents the acid from splattering. Never
add water to acid.
17. In which laboratory process could a student use
0.10 M NaOH(aq) to determine the concentration
of an aqueous solution of HBr?
A)
B)
C)
D)
Decomposition of the solute
Chromatography
Evaporation of the solvent
Titration
 Correct Answer: Option D - Titration
18. Given the balanced equation representing a reaction:
NH3(g) + H2O(l) → NH4+(aq) + OH-(aq)
According to one acid-base theory, the NH3(g) molecules act
as
A)
B)
C)
D)
An acid because they accept H+ ions
An acid because they donate H+ ions
A base because they accept H+ ions
A base because they donate H+ ions
 Correct Answer: Option C - A base because they accept H+
ions
 According to the acid base theory H+ ions or hydronium ions are
given out by acids and accepted by bases. Since, NH3(g) accepts
H+ ion to become NH4+ in the above equation NH3 molecule acts
as a base.
19. What volume of 0.120M HNO3(aq) is needed to completely
neutralize 150 milliliters of 0.100 M NaOH(aq)?
A) 125 mL
B) 62 mL
C) 180 mL
D) 360 mL
 Correct Answer: Option A - 125 mL
 In titration method,
 (Volume of acid) x (molarity of the acid) neutralizes an equal volume





of base x the molarity of the base
VAcid x MAcid = VBase x MBase
where V = volume and M = molarity of HNO3 and NaOH.
i.e. 0.120M x V = 0.100M x 150ml
Volume of HNO3 = (0.100 x 150) / 0.120
= 125mL of 0.120M HNO3
20. The following data were collected at the endpoint of
a titration performed to find the molarity of an HCl
solution.
 Volume of acid (HCl) used = 14.4 mL
 Volume of base (NaOH) used = 22.4 mL
 Molarity of standard base (NaOH) = 0.20 M
 What is the molarity of the acid solution?
A) 1.5M
B) 0.13M
C) 0.31M
D) 0.64 M
 Correct Answer: Option C - 0.31M
21. The reaction between hydroxyl ions and
hydrogen ions is called:
A)
B)
C)
D)
Analysis
Neutralization
Hydrolysis
Decomposition
 Correct Answer: Option B - Neutralization
 Neutralization is a chemical reaction whereby an
acid and a base react to form water and a salt.
22. A water solution of H2S is:
A)
B)
C)
D)
Neutral
Basic
Acidic
Salty
 Correct Answer: Option C - Acidic
24. The acid present in vinegar is:
A)
B)
C)
D)
Hydrogen sulfide
Acetic acid
Nitric acid
Sulfuric acid
 Correct Answer: Option B - Acetic acid
 Correct answer: (2)
 Correct answer: (4) BaSO4
 Correct answer: (3) HBr
 Correct answer: (3) H2SO4(aq) and Ca(OH)2(aq)
 3) is the correct answer;
 3) H3PO4 is the correct answer
 4) KOH is the correct answer
 (2) bromthymol blue is the correct answer.
Which formula represents a salt?
 KOH
 KCl
 CH3OH
 CH3COOH
 Correct answer is KCl
Which solution will turn litmus from red to blue?
 H2S(aq)
 NH3(aq)
 SO2(aq)
 CO2(aq)
 Correct answer is NH3
Which solution will change litmus from blue to red?
 NaOH(aq)
 NH4OH(aq)
 CH3OH(aq)
 CH3COOH(aq)
 Correct Answer is CH3COOH(aq)
Which ion is produced when an Arrhenius base is
dissolved in water?




H+, as the only positive ion in solution
H3O+, as the only positive ion in solution
OH-, as the only negative ion in solution
H-, as the only negative ion in solution
 Correct Answer OH-, as the only negative ion in
solution