WorksheetsUnit 09 Post Assessment Remediation (PAR)
Total questions: 15
Worksheet time: 8mins
Which compound yields H⁺ ions as the only positive ions in an aqueous solution?
KOH
NaOH
CH₃OH
CH₃COOH
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
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
Solution A has a pH value of 2.0 and solution B has a pH value of 4.0. How many times greater is the hydronium ion concentration in solution A than the hydronium ion concentration in solution B?
10
2
100
4
Which indicator would best distinguish between a solution with a pH of 3.5 and a solution with a pH of 5.5?
bromthymol blue
bromcresol green
litmus
thymol blue
The table below shows the color of the indicators methyl orange and bromthymol blue in two samples of the same solution. Results of Acid-Base Indicator Tests. Which pH value is consistent with the indicator results?
1
5
3
10
Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow?
0.1 M HCl
0.1 M NH₃
0.1 M CH₃OH
0.1 M NaOH
If an aqueous solution turns blue litmus red, which relationship exists between the hydronium ion and hydroxide ion concentrations?
[H₃O⁺] > [OH⁻]
[H₃O⁺] < [OH⁻]
[H₃O⁺] = [OH⁻] = 10⁻⁷
[H₃O⁺] = [OH⁻] = 10⁻¹⁴
Which two compounds are electrolytes?
KOH and CH₃COOH
KOH and C₅H₁₂
CH₃OH and CH₃COOH
CH₃OH and C₅H₁₂
An example of a nonelectrolyte is
C₆H₁₂O₆(aq)
K₂SO₄(aq)
NaCl(aq)
HCl(aq)
Which of these pH numbers indicates the highest level of acidity?
5
8
10
12
Which equation represents a neutralization reaction?
HClO → 4HCl + 2ClO₃
CH₄ + 2O₂ → CO₂ + 2H₂O
Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O
Ba(OH)₂ + Cu(NO₃)₂ → Ba(NO₃)₂ + Cu(OH)₂
In a titration, 10.0 mL of 0.0750 M HCl(aq) is exactly neutralized by 30.0 mL of KOH(aq) of unknown concentration. What is the concentration of the KOH(aq) solution?
0.0250 M
0.0750 M
0.225 M
0.333 M
Based on the equation and the titration results, what is the concentration of the H2SO4(aq)?
H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(ℓ)
0.12 M
0.16 M
0.24 M
0.96 M
The table below shows the molar concentrations of hydronium ion, H3O+, in four different solutions. Which solution has the highest pH?
A
B
C
D
Compared to a solution with a pH value of 7, a solution with a thousand times greater hydronium ion concentration has a pH value of
10
7
3
4
